Quarterly report pursuant to Section 13 or 15(d)

Note 6 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details)

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Note 6 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Apr. 01, 2018
Apr. 02, 2017
Apr. 03, 2016
Allocated share-based compensation $ 87,000 $ 135,000 $ 197,000 $ 277,000      
Shares Vested (in shares)     41,726 20,604      
Shares Vested, Aggregate Value     $ 246,000 $ 167,000      
Shares Vested, Taxes Remitted     $ 95,000 $ 56,000      
Performance Shares [Member] | Earned in Fiscal Year 2016, Granted in Fiscal Year 2017 [Member]              
Number of Shares (in shares)     41,205        
Fair Value Per Share (in dollars per share)     $ 7.865        
Allocated share-based compensation       $ 108,000 $ 108,000 $ 108,000
Shares Vested (in shares)     20,601 20,604      
Shares Vested, Aggregate Value     $ 122,000 $ 167,000      
Shares Vested, Taxes Remitted     $ 39,000 $ 56,000      
Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member]              
Number of Shares (in shares)     42,250        
Fair Value Per Share (in dollars per share)     $ 8.271        
Allocated share-based compensation     $ 116,000   $ 116,000 $ 116,000
Shares Vested (in shares)     21,125      
Shares Vested, Aggregate Value     $ 124,000      
Shares Vested, Taxes Remitted     $ 56,000