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Note 16 - Revolving Credit Agreement (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
3 Months Ended
Apr. 08, 2020
Oct. 24, 2017
Jun. 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     $ 200    
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%