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Note 11 - Long-term Debt (Details Textual) - USD ($)
$ in Thousands
1 Months Ended 12 Months Ended
Nov. 30, 2011
Dec. 31, 2015
Dec. 31, 2014
Syndicated Senior Revolving Credit Facility [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate   1.50%  
Syndicated Senior Revolving Credit Facility [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument, Basis Spread on Variable Rate   2.10%  
Syndicated Senior Revolving Credit Facility [Member]      
Line of Credit Facility, Maximum Borrowing Capacity $ 250,000    
Debt Instrument, Term 5 years    
Line of Credit   $ 30,000  
Long-term Debt, Weighted Average Interest Rate   2.30% 2.40%