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Note 16 - Subsequent Event - Revolving Credit Agreement (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
3 Months Ended
Oct. 24, 2017
Jun. 30, 2020
Dec. 31, 2019
Dec. 31, 2018
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%      
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%      
Forecast [Member]        
Proceeds from Long-term Lines of Credit   $ 50,000    
Debt Instrument, Interest Rate, Stated Percentage   2.08%