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Note 8 - Revolving Line of Credit (Details Textual) - USD ($)
$ in Thousands
3 Months Ended
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Line of Credit Facility, Maximum Borrowing Capacity   $ 100,000 $ 75,000
Line of Credit Facility, Remaining Borrowing Capacity   100,000  
Long-term Line of Credit, Total   $ 0  
Minimum [Member]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.15%  
Maximum [Member]      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage   0.225%  
Secured Overnight Financing Rate (SOFR) 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%  
London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.00%  
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.00%  
Base Rate [Member] | Minimum [Member]      
Debt Instrument, Basis Spread on Variable Rate   0.00%  
Base Rate [Member] | Maximum [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.00%