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Note 16 - Revolving Credit Agreement (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Apr. 08, 2020
Oct. 24, 2017
Sep. 30, 2020
Sep. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
Proceeds from Long-term Lines of Credit $ 50,000          
Debt Instrument, Interest Rate, Stated Percentage 2.08%          
Interest Expense, Debt, Total     $ 300 $ 500    
Repayments of Lines of Credit     25,000      
Long-term Line of Credit, Total     $ 25,000 $ 25,000 $ 0 $ 0
Debt Instrument, Term (Year)   5 years        
Line of Credit Facility, Current Borrowing Capacity   $ 50,000        
Line of Credit Facility, Additional Borrowing Capacity   50,000        
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000        
Line of Credit Facility, Commitment Fee Percentage   0.25%        
Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.25%        
Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate   1.75%        
Fed Funds Effective Rate Overnight Index Swap Rate [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.50%        
London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   1.00%