Annual report pursuant to Section 13 and 15(d)

Note 8 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details)

v3.8.0.1
Note 8 - Stock-based Compensation - Grants and Compensation Expense in Connection With the Performance Bonus Plan (Details) - USD ($)
12 Months Ended
Mar. 31, 2019
Apr. 01, 2018
Apr. 02, 2017
Apr. 03, 2016
Mar. 29, 2015
Mar. 30, 2014
Allocated Share Based Compensation Expense   $ 539,000 $ 604,000 $ 906,000    
Performance Shares [Member] | Earned in Fiscal 2014, Granted in Fiscal 2015 [Member]            
Shares Granted (in shares)   188,232        
Fair Value Per Share (in dollars per share)   $ 5.65        
Allocated Share Based Compensation Expense   $ 354,000 $ 354,000 $ 354,000
Shares Vested (in shares)   188,532    
Shares Vested, Aggregate Value   $ 1,618,000    
Shares Vested, Taxes Remitted     789,000    
Performance Shares [Member] | Earned in Fiscal 2014, Granted in Fiscal 2015 [Member] | Scenario, Forecast [Member]            
Allocated Share Based Compensation Expense          
Performance Shares [Member] | Earned in Fiscal Year 2015, Granted in Fiscal Year 2016 [Member]            
Shares Granted (in shares)   58,532        
Fair Value Per Share (in dollars per share)   $ 7.18        
Allocated Share Based Compensation Expense   $ 140,000 $ 140,000 140,000
Shares Vested (in shares)   29,265 29,267    
Shares Vested, Aggregate Value   $ 240,000 $ 275,000    
Shares Vested, Taxes Remitted   86,000 138,000    
Performance Shares [Member] | Earned in Fiscal Year 2015, Granted in Fiscal Year 2016 [Member] | Scenario, Forecast [Member]            
Allocated Share Based Compensation Expense          
Performance Shares [Member] | Earned in Fiscal Year 2016, Granted in Fiscal Year 2017 [Member]            
Shares Granted (in shares)   41,205        
Fair Value Per Share (in dollars per share)   $ 7.865        
Allocated Share Based Compensation Expense   $ 108,000 $ 108,000 $ 108,000
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 2016, Granted in Fiscal Year 2017 [Member] | Scenario, Forecast [Member]            
Allocated Share Based Compensation Expense          
Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member]            
Shares Granted (in shares)   42,250        
Fair Value Per Share (in dollars per share)   $ 8.271        
Allocated Share Based Compensation Expense   $ 116,000 $ 116,000
Performance Shares [Member] | Earned in Fiscal Year 2017, Granted in Fiscal Year 2018 [Member] | Scenario, Forecast [Member]            
Allocated Share Based Compensation Expense $ 116,000