Note 2 - Summary of Significant Accounting Policies (Details Textual) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Cash and Cash Equivalents, at Carrying Value	$ 35,857	$ 42,363	$ 34,265	$ 33,485
Interest-bearing Deposits in Banks and Other Financial Institutions	27,200	23,000
Cash Reserve Deposit Required and Made	10,100	9,900
Goodwill, Impairment Loss	0	0	0
Goodwill	$ 16,127	16,127
Number of Loan Portfolios	2
Fair Value, Collateral Dependent Loans, Percentage of Appraised or Internally Estimated Value of Property	85.00%
Amount of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals	$ 43,300
Percentage of Collateral-dependent Impaired Loans Measured for Impairment By Utilizing Third-party Appraisals	87.50%
Amount of Collateral-Dependent Impaired Loans Measured for Impairment Using Internal Evaluations	$ 6,200
Percentage of Collateral-dependent Impaired Loans Measured for Impairment Using Internal Evaluations	12.50%
Advertising Expense	$ 2,400	2,100	$ 1,800
Loans and Leases Receivable, Impaired, Commitment to Lend	0
Loans Receivable Held-for-sale, Net, Not Part of Disposal Group	$ 0	$ 0
Bank Premises and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Bank Premises and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years
Employee Stock Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	0	0	0