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Note 10 - Borrowings (Details Textual) - USD ($)
$ in Thousands
Apr. 10, 2020
Mar. 30, 2020
Jun. 30, 2020
Dec. 31, 2019
Paycheck Protection Program, CARES Act [Member]        
Proceeds from Issuance of Long-term Debt, Total $ 8,180      
Regions Bank and PNC Bank N.A. [Member] | Revolving Credit Facility [Member]        
Line of Credit Facility, Expiration Period (Year)   5 years    
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000    
Line of Credit Facility Sublimit for Letters of Credit   30,000    
Line of Credit Facility Swingline Loans   15,000    
Line of Credit Facility, Increase (Decrease) in Maximum Borrowing Amount   $ 65,000    
Debt Instrument, Increase (Decrease) in Stated Interest Rate   (0.25%)    
Long-term Line of Credit, Total     $ 0 $ 0