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Note 7 - Revolving Line of Credit and Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended 12 Months Ended
Feb. 28, 2019
Sep. 30, 2020
Jun. 30, 2020
Feb. 27, 2019
Long-term Line of Credit, Total     $ 0  
Line of Credit Facility, Remaining Borrowing Capacity     $ 75,000  
London Interbank Offered Rate (LIBOR) [Member] | Forecast [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.25%    
London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.25%      
London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate 2.50%      
UNITED STATES        
Line of Credit Facility, Maximum Borrowing Capacity $ 75,000     $ 100,000
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.20%