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Note 3 - Investment Securities (Details Textual) - USD ($)
1 Months Ended 3 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Mar. 31, 2016
Mar. 31, 2015
Other Assets [Member]        
Cost Method Investments $ 711,000      
Proceeds from Sale and Maturity of Marketable Securities     $ 0 $ 0
Available-for-Sale, Securities in Unrealized Loss Positions, Depreciation from Amortized Cost Percentage     0.50%  
Equity Method Investment, Number of Common Shares Acquired 31,750 100,000    
Percentage of Outstanding Shares of Voting Common Stock 9.00%