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Note 10 - Revolving Credit Agreement (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
Oct. 24, 2017
Dec. 31, 2019
Dec. 31, 2018
Debt Instrument, Term 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%    
Long-term Line of Credit, Total   $ 0 $ 0
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%