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Note 4 - Loans (Details) - USD ($)
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Receivables [Abstract]      
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans $ 418,400 $ 591,900 $ 968,700
Loans and Leases Receivable, Impaired, Commitment to Lend $ 0    
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down     $ 81,277