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Note 3 - Investment Securities (Details)
 12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Investments, Debt and Equity Securities [Abstract]      
Proceeds from Sale of Available-for-sale Securities $ 28,273,634 $ 13,620,956 $ 72,672,795
Available-for-sale Securities, Gross Realized Gains 207,896 67,601 442,124
Available-for-sale Securities, Gross Realized Losses 196,316 45,666 805,928
Held-to-maturity Securities, Sold Security, Realized Gain (Loss) (23,046) 1,800  
Security Owned and Pledged as Collateral, Fair Value $ 133,754,087 $ 135,531,563  
Depreciated Debt Securities With Unrealized Losses 2.37%    
Number of Asset-backed Securities Owned 1    
Number of Issuance of Trust Preferred Security 1    
Other than Temporary Impairment Losses, Investments     $ 366,623