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Note 5 - Debt (Detail) (USD $)
 12 Months Ended
Dec. 31, 2012
Dec. 31, 2010
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) $ 35,000,000  
Debt Instrument, Fee   $263
Proceeds from Lines of Credit (in Dollars)   9,870,000
Line Of Credit Required Minimum Borrowing Capacity (in Dollars) 3,000,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.50%  
Debt Instrument, Basis Spread on Variable Rate 3.00%  
Line Of Credit, Fixed Interest Rate Term 90 days  
Line Of Credit, Required Fixed Charge Ratio Numerator 1.20  
Line Of Credit, Required Fixed Charge Ratio Denominator 1.00  
Fixed Charge Ratio Numerator 2.15  
Fixed Charge Ratio Denominator 1.00  
Line of Credit Facility, Amount Outstanding (in Dollars) 0  
Line of Credit Facility, Interest Rate at Period End 3.21%  
Line of Credit Facility, Remaining Borrowing Capacity (in Dollars) 13,157,000  
Letters of Credit Outstanding, Amount (in Dollars) 413,000  
Subsequent Event [Member]
    
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) 20,000,000  
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.40%  
Lesser Of (1) [Member]
    
Line of Credit Facility, Maximum Borrowing Capacity (in Dollars) $ 20,000,000  
Lesser Of (2) [Member] | Lesser Of (A) [Member]
    
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Line Of Credit, Maximum Borrowing Capacity, Percentage Of Book Value Of Eligible Inventory 70.00%  
Lesser Of (2) [Member] | Lessor Of (B) [Member]
    
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Appraised Net Orderly Liquidation Value Of Eligible Inventory 85.00%  
Lesser Of (2) [Member]
    
Line Of Credit, Maximum Borrowing Capacity, Percentage Of Eligible Accounts Receivable 85.00%