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Note 4 - Investment (Details Textual) - Korea Line Corporation [Member] - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Oct. 15, 2014
Dec. 31, 2014
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
Dec. 31, 2015
Unrealized Gain (Loss) on Investments $ 0.2   $ 0.3 $ 1.4 $ (2.1)  
Other than Temporary Impairment Losses, Investments   $ 1.0        
Proceeds from Sale of Available-for-sale Securities           $ 7.8
Realized Investment Gains (Losses)           $ (0.5)