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Note 6 - Debt (Details Textual) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Apr. 30, 2014
Line of Credit Facility, Maximum Borrowing Capacity $ 20,000      
Line of Credit Facility, Remaining Borrowing Capacity 9,549      
Cash $ 10,629 $ 14,393 $ 17,711  
Line of Credit, Maximum Borrowing Capacity, Percentage of Eligible Accounts Receivable 85.00%      
Line of Credit, Maximum Borrowing Capacity, Percentage of Book Value of Eligible Inventory 65.00%      
Line of Credit, Maximum Borrowing Capacity, Percentage of Appraised Net Orderly Liquidation Value of Eligible Inventory 85.00%      
Line of Credit Minimum Additional Borrowing Capacity in Addition to Accounts Receivable $ 7,500      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%      
Minimum Fixed Charge Coverage Ratio 1.15      
Long-term Line of Credit $ 0      
Line of Credit Facility, Interest Rate at Period End 4.50%      
Letters of Credit Outstanding, Amount $ 0      
Minimum [Member]        
Line of Credit Facility, Remaining Borrowing Capacity       $ 6,000
Cash       $ 8,000
Letter of Credit [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 1,000