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Note 11 - Revolving Credit Agreement (Details Textual) - Revolving Credit Facility [Member] - USD ($)
$ in Thousands
12 Months Ended
Nov. 12, 2021
Apr. 08, 2020
Dec. 31, 2020
Dec. 31, 2021
Line of Credit Facility, Current Borrowing Capacity $ 75,000      
Line of Credit Facility, Additional Borrowing Capacity 75,000      
Line of Credit Facility, Maximum Borrowing Capacity $ 150,000      
Debt Instrument, Term (Year) 5 years      
Long-term Line of Credit, Total     $ 0 $ 0
Proceeds from Long-term Lines of Credit   $ 50,000    
Debt Instrument, Interest Rate, Stated Percentage   2.08%    
Interest Expense, Debt, Total     $ 800  
Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate 0.25%      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.20%      
Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate 1.00%      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.30%