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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
Mar. 31, 2017
Dec. 31, 2016
LT Liabilities:    
$ (883) $ (1,016)
(883) (1,016)
Long [Member]    
ST Liabilities:    
Interest rate swaps (810) (916)
Interest rate swaps (810) (916)
Short [Member]    
LT Liabilities:    
Interest rate swaps (73) (100)
Interest rate swaps $ (73) $ (100)