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 9 Months Ended 12 Months Ended
Dec. 31, 2017
Jul. 02, 2017
Jan. 01, 2017
Jul. 03, 2016
Dec. 31, 2017
Jan. 01, 2017
Mar. 31, 2019
Apr. 01, 2018
Apr. 02, 2017
Apr. 03, 2016
Mar. 29, 2015
Grant Date (in shares)                   41,205  
Allocated share-based compensation $ 129,000   $ 149,000   $ 406,000 $ 456,000          
Shares Vested (in shares)   20,604                
Shares Vested, Aggregate Value   $ 167,000                
Shares Vested, Taxes Remitted   $ 56,000                
Performance Shares [Member] | Earned in Fiscal Year 2015, Granted in Fiscal Year 2016 [Member]                      
Grant Date (in shares)                   58,532  
Fair Value Per Share (in dollars per share)                   $ 7.18  
Allocated share-based compensation                 $ 140,000 $ 140,000 $ 140,000
Performance Shares [Member] | Earned in Fiscal Year 2016, Granted in Fiscal Year 2017 [Member]                      
Grant Date (in shares)                 41,205    
Fair Value Per Share (in dollars per share)                 $ 7.865    
Allocated share-based compensation               $ 108,000 $ 108,000 $ 108,000  
Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member]                      
Grant Date (in shares)               42,250      
Fair Value Per Share (in dollars per share)               $ 8.271      
Allocated share-based compensation             $ 116,000 $ 116,000 $ 116,000