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Note 3 - Financial Instruments and Fair Value (Details) - Fair Value, by Balance Sheet Grouping - Fair Value, Inputs, Level 2 [Member] - Interest Rate Swap [Member] - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
LT Liabilities:    
$ (3,303) $ (1,602)
(3,303) (1,602)
Long [Member]    
ST Liabilities:    
Interest rate swaps (1,085) (1,171)
Interest rate swaps (1,085) (1,171)
Short [Member]    
LT Liabilities:    
Interest rate swaps (2,218) (431)
Interest rate swaps $ (2,218) $ (431)