Note 3 - Loans and Allowance for Loan Losses (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Impaired Financing Receivable, Interest Income, Accrual Method	$ 2,000	$ 4,000	$ 200,000
Impaired Financing Receivable, Average Recorded Investment	12,010,000	8,110,000	8,665,000
Allowance for Loan and Lease Losses, Write-offs	$ 1,699,000	$ 1,451,000	$ 2,715,000
Weighted Average Interest Rate On Loans Receivable	4.81%	4.87%
Mortgage Receivable [Member]
Servicing Asset at Amortized Cost	$ 54,722	$ 64,220
Commercial Loans [Member]
Servicing Asset at Amortized Cost	5,978,363	7,629,058
Troubled Debt Restructurings [Member]
Allowance for Loan and Lease Losses, Period Increase (Decrease)	41,458	0
Allowance for Loan and Lease Losses, Write-offs	$ 0	$ 1,233,075