Note 4 - Loans Receivable (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2016	Dec. 31, 2015	Jun. 30, 2015
Commercial Real Estate Portfolio Segment [Member] | United States Department of Agriculture Rural Development [Member]
Loans and Leases Receivable, Gross	$ 11,853,000	$ 12,117,000
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross	200,848,000	167,930,000	$ 136,384,000
Commercial Portfolio Segment [Member] | Syndicated Loan Facility [Member]
Loans and Leases Receivable, Gross	$ 1,832,000	1,917,000
Commercial Portfolio Segment [Member] | Minimum [Member]
Quarterly Review Criteria, Period of Delinquency on Loans	60 days
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Gross	$ 48,982,000	39,072,000	44,247,000
Consumer Portfolio Segment [Member] | Minimum [Member]
Quarterly Review Criteria, Period of Delinquency on Loans	90 days
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Gross	$ 14,618,000	14,641,000	14,480,000
Loans and Leases Receivable, Gross	444,879,000	$ 408,079,000	$ 358,975,000
Minimum Principal Balance of Loans for Quarterly Rating Review	$ 750,000