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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
May 02, 2018
Interest Rate Swap [Member]      
Derivative Liability, Notional Amount $ 11.3    
Interest Rate Swap [Member] | Interest Expense [Member]      
Gain (Loss) on Derivative Instruments, Net, Pretax, Total (0.3) $ 0.2  
Credit Agreement [Member] | Term Loan 2 [Member]      
Long-Term Debt, Maturity, Remainder of Fiscal Year 4.6    
Long-Term Debt, Maturity, Year Five 9.3    
Long-Term Debt, Maturity, Year Three 9.3    
Long Term Debt Maturities Repayments of Principal in Year Seven 3.1    
Long-Term Debt, Maturity, Year Four 9.3    
Long Term Debt Maturities Repayments of Principal in Year Six $ 9.3    
Credit Agreement [Member] | Term Loan 2 [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.85%    
Credit Agreement [Member] | Term Loan 2 [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.65%    
Credit Agreement [Member] | Term Loan [Member]      
Debt Instrument, Interest Rate, Effective Percentage 0.86%    
Long-Term Debt, Maturity, Remainder of Fiscal Year $ 3.0    
Long-Term Debt, Maturity, Year Two 6.0    
Long-Term Debt, Maturity, Year Five 3.0    
Long-Term Debt, Maturity, Year Three 6.0    
Long-Term Debt, Maturity, Year Four $ 6.0    
Credit Agreement [Member] | Term Loan [Member] | Minimum [Member]      
Debt Instrument, Interest Rate, Effective Percentage 1.03%    
Credit Agreement [Member] | Term Loan [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 0.68%    
Credit Agreement [Member] | Term Loan [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Revolving Credit Facility [Member] | BB&T [Member] | Credit Agreement [Member]      
Line of Credit Facility, Maximum Borrowing Capacity     $ 75.0