Quarterly report pursuant to Section 13 or 15(d)

Note 7 - Stock-based Compensation - Estimated Fair Value of Stock Options Assumptions (Details)

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Note 7 - Stock-based Compensation - Estimated Fair Value of Stock Options Assumptions (Details) - $ / shares
3 Months Ended
Jun. 28, 2020
Jun. 30, 2019
Number of options issued (in shares) 110,000 125,000
June 13, 2019 [Member]    
Number of options issued (in shares) 110,000  
Grant date Jun. 10, 2020  
Dividend yield 6.50%  
Expected volatility 30.00%  
Risk free interest rate 0.275%  
Contractual term (years) (Year) 10 years  
Expected term (years) (Year) 4 years  
Forfeiture rate 5.00%  
Exercise price (grant-date closing price) per option (in dollars per share) $ 4.92  
Fair value per option (in dollars per share) $ 0.56  
June 13, 2018 [Member]    
Number of options issued (in shares)   125,000
Grant date   Jun. 13, 2019
Dividend yield   6.72%
Expected volatility   25.00%
Risk free interest rate   1.81%
Contractual term (years) (Year)   10 years
Expected term (years) (Year)   4 years
Forfeiture rate   5.00%
Exercise price (grant-date closing price) per option (in dollars per share)   $ 4.76
Fair value per option (in dollars per share)   $ 0.39