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Note 5 - Debt (Details Textual) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Apr. 17, 2020
Jun. 30, 2020
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
May 15, 2019
Proceeds from Lines of Credit, Total     $ 20,933,000 $ 35,307,000    
Repayments of Lines of Credit     76,000,000 $ 7,500,000    
Amortization of Debt Issuance Costs     800,000      
Unamortized Debt Issuance Expense   $ 1,400,000 1,400,000      
Credit Facility [Member]            
Debt Agreement, Maximum Borrowing Capacity $ 165,000,000.0          
Long-term Debt, Total   0 0      
Proceeds from Debt Agreement   20,900,000     $ 54,500,000  
Repayments of Lines of Credit     76,000,000.0      
Credit Facility [Member] | Base Rate [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.50%          
Credit Facility [Member] | Base Rate [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.00%          
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]            
Debt Instrument, Basis Spread on Variable Rate 1.50%          
Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]            
Debt Instrument, Basis Spread on Variable Rate 2.00%          
Credit Facility [Member] | Revolving Credit Facility [Member]            
Line of Credit Facility, Maximum Borrowing Capacity $ 35,000,000.0         $ 35,000,000.0
Proceeds from Lines of Credit, Total   7,000,000.0     14,000,000.0  
Credit Facility [Member] | Draw Term Loan [Member]            
Long-term Debt, Total $ 130,000,000.0         $ 55,000,000.0
Proceeds from Issuance of Long-term Debt, Total   13,900,000     40,500,000  
Debt Issuance Costs, Net, Total   $ 100,000 $ 100,000   $ 600,000