Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Financing Arrangements (Details Textual)

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Note 5 - Financing Arrangements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 19, 2017
May 16, 2017
Oct. 01, 2017
Oct. 02, 2016
Oct. 01, 2017
Oct. 02, 2016
Apr. 02, 2017
Apr. 02, 2016
Selling, General and Administrative Expense     $ 3,807,000 $ 2,761,000 $ 6,708,000 $ 5,600,000    
Daily Cash Balance, Interest Rate, Stated Percentage         2.25%      
Line of Credit Facility, Remaining Borrowing Capacity     18,500,000   $ 18,500,000   $ 21,400,000  
Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity     26,000,000   26,000,000      
Long-term Line of Credit     0   0     $ 0
Letters of Credit Outstanding, Amount     0   $ 0     $ 0
Revolving Credit Facility [Member] | Prime Rate [Member]                
Debt Instrument Basis Spread Below Variable Rate         0.50%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]                
Debt Instrument, Basis Spread on Variable Rate         2.00%      
Letter of Credit [Member]                
Line of Credit Facility, Maximum Borrowing Capacity     1,500,000   $ 1,500,000      
Factoring Fees [Member]                
Selling, General and Administrative Expense     50,000 $ 112,000 115,000 $ 206,000    
Chase Bank N.A. [Member] | Master Stand-by Claims Purchase Agreement [Member]                
Purchase Agreement, Monthly Fee, Percentage of Accounts Receivable   1.65%            
Purchase Agreement, Limit of Accounts Receivable Used in Determination of Monthly Fee   $ 1,800,000            
Selling, General and Administrative Expense     416,000   480,000      
Chase Bank N.A. [Member] | Master Stand-by Claims Purchase Agreement [Member] | Other Accounts Receivable [Member]                
Accounts Receivable, Net     866,000   866,000      
Chase Bank N.A. [Member] | Master Stand by Claims Second Purchase Agreement [Member]                
Purchase Agreement, Monthly Fee, Percentage of Accounts Receivable 1.50%              
Purchase Agreement, Limit of Accounts Receivable Used in Determination of Monthly Fee $ 1,800,000              
Accounts Receivable, Net     249,000   $ 249,000      
Selling, General and Administrative Expense     $ 11,000