Annual report pursuant to Section 13 and 15(d)

Note 9 - Stock-based Compensation - Non-vested Stock to Directors and Employees (Details)

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Note 9 - Stock-based Compensation - Non-vested Stock to Directors and Employees (Details) - Non-vested Stock Grants [Member]
 12 Months Ended
Mar. 28, 2021
$ / shares
shares
January 18, 2019 [Member] | Share-based Payment Arrangement, Employee [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.86
Number of Shares (in shares) | shares 25,000
June 10, 2020 [Member] | Share-based Payment Arrangement, Employee [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 4.92
Number of Shares (in shares) | shares 20,000
February 22, 2021 [Member] | Share-based Payment Arrangement, Employee [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 7.60
Number of Shares (in shares) | shares 10,000
Non Employee Directors [Member] | August 12, 2020 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.79
Number of Shares (in shares) | shares 41,452
Non Employee Directors [Member] | August 14, 2019 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.16
Number of Shares (in shares) | shares 46,512
Non Employee Directors [Member] | August 8, 2018 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.43
Number of Shares (in shares) | shares 28,000
Non Employee Directors [Member] | August 9 2017 [Member]  
Fair Value Per Share (in dollars per share) | $ / shares $ 5.50
Number of Shares (in shares) | shares 28,000