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Note 3 - Long-term Debt (Details Textual) - USD ($)
$ in Millions
6 Months Ended
Feb. 08, 2021
Jun. 30, 2021
Jun. 30, 2020
Dec. 31, 2020
Interest Rate Swap [Member]        
Derivative Liability, Notional Amount   $ 8.3    
Gain (Loss) on Derivative Instruments, Net, Pretax, Total     $ (0.3)  
Credit Agreement [Member]        
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.15%      
Credit Agreement [Member] | Term Loan 2 [Member]        
Debt Instrument, Interest Rate, Effective Percentage   0.94%    
Long-Term Debt, Maturity, Remainder of Fiscal Year   $ 4.6    
Long-Term Debt, Maturity, Year One   9.3    
Long-Term Debt, Maturity, Year Three   9.3    
Long-Term Debt, Maturity, Year Five   3.1    
Long-Term Debt, Maturity, Year Two   9.3    
Long-Term Debt, Maturity, Year Four   $ 9.3    
Credit Agreement [Member] | Term Loan [Member]        
Debt Instrument, Interest Rate, Effective Percentage   0.77%    
Long-Term Debt, Maturity, Remainder of Fiscal Year   $ 3.0    
Long-Term Debt, Maturity, Year One   6.0    
Long-Term Debt, Maturity, Year Three   3.0    
Long-Term Debt, Maturity, Year Two   $ 6.0    
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.85%    
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan 2 [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.65%    
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Minimum [Member]        
Debt Instrument, Basis Spread on Variable Rate   0.68%    
Credit Agreement [Member] | London Interbank Offered Rate (LIBOR) [Member] | Term Loan [Member] | Maximum [Member]        
Debt Instrument, Basis Spread on Variable Rate   1.50%    
Credit Agreement [Member] | Revolving Credit Facility [Member]        
Debt Instrument, Interest Rate, Effective Percentage   0.93%    
Credit Agreement [Member] | Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, LIBOR Floor 0.25%      
Credit Agreement [Member] | Revolving Credit Facility [Member] | BB&T [Member]        
Line of Credit Facility, Maximum Borrowing Capacity $ 125.0     $ 75.0
Credit Agreement [Member] | Revolving Credit Facility [Member] | BB&T [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, LIBOR Floor 0.25%      
Credit Agreement [Member] | Revolving Credit Facility [Member] | Fifth Third Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]        
Debt Instrument, LIBOR Floor       0.00%
Credit Agreement [Member] | Letter of Credit [Member]        
Letters of Credit Outstanding, Amount   $ 0.6