Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Non-vested Stock to Directors (Details)

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Note 6 - Stock-based Compensation - Non-vested Stock to Directors (Details) - Non Employee Directors [Member] - Non-vested Stock Grants [Member]
 9 Months Ended
Dec. 31, 2018
$ / shares
shares
August 8, 2018 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.43
Number of Shares (in shares) | shares 28,000
August 9 2017 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.50
Number of Shares (in shares) | shares 28,000
August 10, 2016 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 10.08
Number of Shares (in shares) | shares 28,000
August 12, 2015 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 8.20
Number of Shares (in shares) | shares 28,000