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Note 6 - Long-term Debt (Details Textual)
 12 Months Ended
Dec. 31, 2017
USD ($)
Line of Credit Facility, Interest Rate at Period End 2.86%
Letters of Credit Outstanding, Amount $ 706,000
Line of Credit [Member]  
Debt Instrument, Face Amount $ 40,000,000
Ratio of Indebtedness to Net Capital 4
Line of Credit Facility, Outstanding Advances $ 700,000
Letters of Credit Outstanding, Amount 700,000
Line of Credit Facility, Remaining Borrowing Capacity $ 39,300,000
Line of Credit [Member] | Equipment Financing [Member]  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 2.52%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Debt Instrument, Basis Spread on Variable Rate 1.50%