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Note 11 - Investment in Joint Venture and Other Investment (Details Textual) - USD ($)
3 Months Ended 12 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Dec. 31, 2016
Investment Income, Dividend $ 341,571  
Euromar LLC, The Joint Venture [Member]      
Equity Method Investment, Other than Temporary Impairment     $ 14,100,000
Escrow Deposit     4,000,000
Equity Method Investments $ 0   $ 0
Investment Income, Dividend   $ 341,571