Quarterly report pursuant to Section 13 or 15(d)

Note 5 - Debt (Details Textual)

v3.10.0.1
Note 5 - Debt (Details Textual) - PNC Bank [Member] - USD ($)
$ in Thousands
9 Months Ended
Mar. 28, 2018
Sep. 30, 2018
Dec. 31, 2017
Oct. 01, 2017
Debt Instrument, Face Amount   $ 10,000    
Line of Credit Facility, Periodic Payment   500    
Long-term Line of Credit, Total   $ 6,500 $ 8,000  
Revolving Credit Facility [Member]        
Debt, Weighted Average Interest Rate   5.70%   4.80%
Line of Credit Facility, Remaining Borrowing Capacity   $ 10,545 5,295  
Line of Credit Facility, Maximum Borrowing Capacity   30,000    
Long-term Line of Credit, Total   16,706 12,191  
Equipment Facility [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 3,000      
Maximum Aggregate Loans Advanced for Purchase of Equipment $ 2,000      
Debt Instrument, Term 3 years      
Line of Credit Facility, Periodic Payment   58    
Line of Credit Facility, Fair Value of Amount Outstanding   2,629    
Long-term Line of Credit, Total   $ 2,629 $ 0  
Base Rate [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
Base Rate [Member] | Revolving Credit Facility [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.75%    
Base Rate [Member] | Equipment Facility [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.75%