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Note 7 - Long-term Debt (Details Textual)
 12 Months Ended
Dec. 31, 2018
USD ($)
Letters of Credit Outstanding, Amount $ 700,000
Line of Credit [Member]  
Line of Credit Facility, Maximum Borrowing Capacity $ 40,000,000
Line of Credit Facility, Interest Rate at Period End 3.85%
Ratio of Indebtedness to Net Capital 4
Line of Credit Facility, Outstanding Advances $ 10,900,000
Letters of Credit Outstanding, Amount 700,000
Line of Credit Facility, Remaining Borrowing Capacity $ 29,100,000
Line of Credit [Member] | Equipment Financing [Member]  
Long-term Debt, Weighted Average Interest Rate, at Point in Time 3.61%
Line of Credit [Member] | London Interbank Offered Rate (LIBOR) [Member]  
Debt Instrument, Basis Spread on Variable Rate 1.50%