Note 8 - Stock-based Compensation (Tables)
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12 Months Ended |
Mar. 31, 2019 |
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| Notes Tables |
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| Share-based Payment Arrangement, Option, Activity [Table Text Block] |
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Outstanding at Beginning of Period | | $ | 7.93 | | | | 395,000 | | | $ | 8.35 | | | | 322,500 | | | Granted | | | 5.90 | | | | 110,000 | | | | 7.35 | | | | 140,000 | | | Forfeited | | | 7.83 | | | | (47,500 | ) | | | 9.05 | | | | (67,500 | ) | | Outstanding at End of Period | | | 7.45 | | | | 457,500 | | | | 7.93 | | | | 395,000 | | | Exercisable at End of Period | | | 8.03 | | | | 292,500 | | | | 7.94 | | | | 220,000 | | |
| Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block] |
| | | Stock Options Granted to Employees During Fiscal Years Ended | | | | | | | | | | | | | | | | | | | Number of options issued | | | 110,000 | | | | 10,000 | | | | 20,000 | | | | 110,000 | | | Grant date | | | June 13, 2018 | | | | December 18, 2017 | | | | August 4, 2017 | | | | June 8, 2017 | | | Dividend yield | | | 5.42 | % | | | 4.92 | % | | | 5.77 | % | | | 4.13 | % | | Expected volatility | | | 25.00 | % | | | 25.00 | % | | | 25.00 | % | | | 25.00 | % | | Risk free interest rate | | | 2.78 | % | | | 1.94 | % | | | 1.51 | % | | | 1.47 | % | | Contractual term (years) | | | 10.00 | | | | 10.00 | | | | 10.00 | | | | 10.00 | | | Expected term (years) | | | 4.00 | | | | 3.00 | | | | 3.00 | | | | 3.00 | | | Forfeiture rate | | | 5.00 | % | | | 5.00 | % | | | 5.00 | % | | | 5.00 | % | | Exercise price (grant-date closing price) per option | | $ | 5.90 | | | $ | 6.50 | | | $ | 5.55 | | | $ | 7.75 | | | Fair value per option | | $ | 0.49 | | | $ | 0.59 | | | $ | 0.50 | | | $ | 0.85 | | |
| Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block] |
| | | Fiscal Year Ended March 31, 2019 | | | | | | | | | | | | | | | | | | | | | | | | | Options Granted in Fiscal Year | | | | | | | | | | | 2017 | | $ | 6 | | | $ | 4 | | | $ | 10 | | | 2018 | | | 17 | | | | 26 | | | | 43 | | | 2019 | | | 7 | | | | 13 | | | | 20 | | | | | | | | | | | | | | | | | Total stock option compensation | | $ | 30 | | | $ | 43 | | | $ | 73 | | | | | Fiscal Year Ended April 1, 2018 | | | | | | | | | | | | | | | | | | | | | | | | | Options Granted in Fiscal Year | | | | | | | | | | | 2016 | | $ | 6 | | | $ | 1 | | | $ | 7 | | | 2017 | | | 26 | | | | 15 | | | | 41 | | | 2018 | | | 17 | | | | 19 | | | | 36 | | | | | | | | | | | | | | | | | Total stock option compensation | | $ | 49 | | | $ | 35 | | | $ | 84 | | |
| Share-based Payment Arrangement, Option, Exercise Price Range [Table Text Block] |
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| | | $4.00 | - | 4.99 | | | | 5,000 | | | | 2.20 | | | $ | 4.81 | | | | 5,000 | | | $ | 4.81 | | | $5.00 | - | 5.99 | | | | 140,000 | | | | 8.29 | | | $ | 5.81 | | | | 25,000 | | | $ | 5.45 | | | $6.00 | - | 6.99 | | | | 30,000 | | | | 5.71 | | | $ | 6.26 | | | | 25,000 | | | $ | 6.21 | | | $7.00 | - | 7.99 | | | | 142,500 | | | | 7.09 | | | $ | 7.81 | | | | 97,500 | | | $ | 7.83 | | | $8.00 | - | 8.99 | | | | 60,000 | | | | 6.20 | | | $ | 8.38 | | | | 60,000 | | | $ | 8.38 | | | $9.00 | - | 9.99 | | | | 80,000 | | | | 7.19 | | | $ | 9.60 | | | | 80,000 | | | $ | 9.60 | | | | | | | | | 457,500 | | | | 7.21 | | | $ | 7.45 | | | | 292,500 | | | $ | 8.03 | | |
| Share-based Payment Arrangement, Nonemployee Director Award Plan, Activity [Table Text Block] |
| | | | | | | | | | | | | | | 28,000 | | | | $5.43 | |
August 8, 2018 | | 28,000 | | | | 5.50 | |
August 9, 2017 | | 28,000 | | | | 10.08 | |
August 10, 2016 | | 28,000 | | | | 8.20 | |
August 12, 2015 | |
| Schedule of Nonvested Share Activity [Table Text Block] |
| | | | | | | | | | | | Stock Granted in Fiscal Year | | | | | | | | | | | 2017 | | $ | - | | | $ | 47 | | | $ | 47 | | | 2018 | | | 116 | | | | 77 | | | | 193 | | | 2019 | | | 13 | | | | 51 | | | | 64 | | | | | | | | | | | | | | | | | Total stock grant compensation | | $ | 129 | | | $ | 175 | | | $ | 304 | | | | | | | | | | | | | | Stock Granted in Fiscal Year | | | | | | | | | | | 2016 | | $ | - | | | $ | 38 | | | $ | 38 | | | 2017 | | | 108 | | | | 141 | | | | 249 | | | 2018 | | | 116 | | | | 52 | | | | 168 | | | | | | | | | | | | | | | | | Total stock grant compensation | | $ | 224 | | | $ | 231 | | | $ | 455 | | |
| Performance Shares [Member] |
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| Notes Tables |
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| Disclosure of Share-based Compensation Arrangements by Share-based Payment Award [Table Text Block] |
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Compensation expense recognized during fiscal year | | | | |
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| | | 2016 | | | 41,205 | | | | 2017 | | | $ | 7.865 | | | $ | 108,000 | | | $ | 108,000 | | | $ | 108,000 | | | $ | - | | | 2017 | | | 42,250 | | | | 2018 | | | | 8.271 | | | | - | | | | 116,000 | | | | 116,000 | | | | 116,000 | | | | | | | | |
Vesting of shares during the
fiscal year
ended
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| | | 2017 | | | 41,205 | | | | 20,601 | | | $ | 122,000 | | | $ | 39,000 | | | | 20,604 | | | $ | 167,000 | | | $ | 56,000 | | | 2018 | | | 42,250 | | | | 21,125 | | | | 124,000 | | | | 56,000 | | | | - | | | | - | | | | - | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Total | | | | 41,726 | | | $ | 246,000 | | | $ | 95,000 | | | | 20,604 | | | $ | 167,000 | | | $ | 56,000 | | |