Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Financing Arrangements (Details Textual)

v3.10.0.1
Note 5 - Financing Arrangements (Details Textual) - USD ($)
3 Months Ended 6 Months Ended
Sep. 19, 2017
May 16, 2017
Sep. 30, 2018
Oct. 01, 2017
Sep. 30, 2018
Oct. 01, 2017
Apr. 01, 2018
Sep. 18, 2017
Selling, General and Administrative Expense, Total     $ 3,827,000 $ 3,807,000 $ 7,512,000 $ 6,708,000    
Line of Credit Facility, Remaining Borrowing Capacity     18,500,000   18,500,000   $ 13,200,000  
Revolving Credit Facility [Member]                
Line of Credit Facility, Maximum Borrowing Capacity     26,000,000   26,000,000      
Long-term Line of Credit, Total     4,400,000   4,400,000   9,500,000  
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         1.75%      
Debt Instrument, Interest Rate, Effective Percentage     3.86%   3.86%      
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, Total     72,000 50,000 128,000 115,000    
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, Total       416,000   $ 480,000    
Chase Bank N.A. [Member] | Master Stand-by Claims Purchase Agreement [Member] | Other Accounts Receivable [Member]                
Accounts Receivable, Net, Total     $ 746,000   $ 746,000     $ 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              
Selling, General and Administrative Expense, Total       $ 11,000