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Note 19 - Subsequent Events (Details Textual) - USD ($)
$ in Thousands
12 Months Ended
Jan. 22, 2019
May 02, 2018
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
May 01, 2018
Repayments of Long-term Debt, Total     $ 127,439 $ 77,573 $ 106,827  
Long-term Debt, Gross     117,693 $ 38,975    
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months     6,000      
Long-term Debt, Maturities, Repayments of Principal in Year Two     6,000      
Long-term Debt, Maturities, Repayments of Principal in Year Three     6,000      
Long-term Debt, Maturities, Repayments of Principal in Year Four     6,000      
Long-term Debt, Maturities, Repayments of Principal in Year Five     6,000      
Long Term Debt Maturities Repayments of Principal in Year Six     $ 1,500      
Long Term Debt Maturities Repayments of Principal in Year Seven           $ 3,050
Credit Agreement [Member] | Term Loan 2 [Member]            
Debt Instrument, Face Amount   $ 85,000        
Credit Agreement [Member] | Term Loan 2 [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate   0.93%        
Credit Agreement [Member] | Term Loan 2 [Member] | Subsequent Event [Member]            
Debt Instrument, Face Amount $ 85,000          
Repayments of Long-term Debt, Total 20,000          
Long-term Debt, Gross 65,000          
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months 8,500          
Long-term Debt, Maturities, Repayments of Principal in Year Two 9,300          
Long Term Debt Maturities Repayments of Principal in Year Eight 800          
Long-term Debt, Maturities, Repayments of Principal in Year Three 9,300          
Long-term Debt, Maturities, Repayments of Principal in Year Four 9,300          
Long-term Debt, Maturities, Repayments of Principal in Year Five 9,300          
Long Term Debt Maturities Repayments of Principal in Year Six 9,300          
Long Term Debt Maturities Repayments of Principal in Year Seven $ 9,300          
Credit Agreement [Member] | Term Loan 2 [Member] | Subsequent Event [Member] | London Interbank Offered Rate (LIBOR) [Member]            
Debt Instrument, Basis Spread on Variable Rate 0.85%