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Note 13 - Derivative Financial Instruments (Details Textual) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Mar. 12, 2018
Oct. 31, 2015
Derivative Assets (Liabilities), at Fair Value, Net, Total $ (4,127)   $ 1,719    
Gain (Loss) on Foreign Currency Derivatives Recorded in Earnings, Net (300) $ (300)      
Derivative, Fixed Interest Rate       2.937%  
A 2015 Interest Rate Swap [Member]          
Derivative, Fixed Interest Rate         1.46%
Derivative Asset, Notional Amount         $ 262,500
A 2018 Interest Rate Swap [Member]          
Derivative, Amount of Hedged Item       $ 170,600  
Derivative, Fixed Interest Rate       2.937%  
Derivative Asset, Notional Amount       $ 170,600  
A 2015 Credit Facility [Member]          
Derivative, Amount of Hedged Item         262,500
Line of Credit Facility, Maximum Borrowing Capacity         $ 350,000
A 2018 Credit Facility [Member]          
Derivative Asset, Notional Amount       $ 170,600  
Fair Value, Recurring [Member] | Designated as Hedging Instrument [Member]          
Derivative Assets (Liabilities), at Fair Value, Net, Total $ 4,100   $ 1,800