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Note 7 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
Dec. 31, 2020
Dec. 31, 2019
Feb. 13, 2019
Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 75,000
Line of Credit Facility, Additional Increase in Maximum Borrowing Capacity     25,000
Line of Credit Facility, Current Borrowing Capacity $ 70,800    
Long-term Line of Credit, Total $ 0 $ 0  
Letter of Credit [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 7,500