Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Financing Arrangements (Details Textual)

v3.8.0.1
Note 5 - Financing Arrangements (Details Textual) - USD ($)
3 Months Ended 9 Months Ended
Sep. 19, 2017
May 16, 2017
Dec. 31, 2017
Jan. 01, 2017
Dec. 31, 2017
Jan. 01, 2017
Apr. 02, 2017
Selling, General and Administrative Expense     $ 3,656,000 $ 2,576,000 $ 10,364,000 $ 8,176,000  
Line of Credit Facility, Remaining Borrowing Capacity     18,900,000   18,900,000   $ 21,400,000
Revolving Credit Facility [Member]              
Line of Credit Facility, Maximum Borrowing Capacity     $ 26,000,000   $ 26,000,000    
Debt Instrument, Interest Rate, Effective Percentage     3.37%   3.37%    
Long-term Line of Credit     $ 2,300,000   $ 2,300,000   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     49,000 $ 101,000 164,000 $ 307,000  
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         480,000    
Chase Bank N.A. [Member] | Master Stand-by Claims Purchase Agreement [Member] | Other Accounts Receivable [Member]              
Accounts Receivable, Net     755,000   755,000    
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     1,300,000   1,300,000    
Selling, General and Administrative Expense     $ 81,000   $ 92,000