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Note 9 - Stock Based Compensation (Details Textual) - USD ($)
12 Months Ended
Apr. 02, 2019
Apr. 02, 2018
Apr. 02, 2017
Apr. 02, 2014
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Plan 1998 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant         0    
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         1,215,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage Per Year         25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years    
Plan 2008 [Member] | Owners of 10% or More of Total Combined Voting Power [Member]              
Share-based Compensation, Shares Authorized under Stock Incentive Plans, Minimum Percentage of Common Stock Fair Market Value, Exercise Price         110.00%    
Plan 2008 [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         200,000 0 212,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized         500,000    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years    
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period Percentage Per Year         25.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period         10 years    
Share-based Compensation, Shares Authorized under Stock Incentive Plans, Minimum Percentage of Common Stock Fair Market Value, Exercise Price         100.00%    
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options         $ 2,800    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested in Period, Fair Value         $ 56,900 $ 2,900 $ 120,000
Scenario, Forecast [Member] | Restricted Stock [Member] | Executive Vice President [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period 33,334 33,333 33,333        
Restricted Stock [Member] | Executive Vice President [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period       100,000      
Restricted Stock [Member]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1]              
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period              
Share Price       $ 1.61      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized         $ 108,000    
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense         $ 0 0 0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross         200,000,000    
Allocated Share-based Compensation Expense         $ 96,000 $ 5,000 $ 60,000
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period         4 years    
[1] Restricted stock was granted on April 1, 2014 to Daniel K. Jan of 100,000 shares to vest 33,333 on April 1, 2017; 33,333 to vest April 1, 2018 and 33,334 to vest April 1, 2019. The award is part of his employment agreement and the grant price is the closing price of the stock on April 1, 2014 of $1.61. The unvested shares are forfeited upon termination of his employment.