Note 3 - Fair Value of Financial Instruments (Details Textual) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015	Dec. 31, 2015
Collateral Dependent Loans [Member]
Impaired Financing Receivable, with Related Allowance, Recorded Investment	$ 9,169,000		$ 9,169,000		$ 7,811,000
Impaired Financing Receivable, Related Allowance	2,881,000		2,881,000		1,559,000
Provision for Loan Losses Expensed	819,000	$ 107,000	2,477,000	$ 94,000	741,000
Financing Receivables, Impaired, Troubled Debt Restructuring, Write-down			$ 0	1,782,000	1,422,000
Selling Costs, Percentage			10.00%
Impaired Financing Receivable, Related Allowance	2,952,000		$ 2,952,000		2,164,000
Other Real Estate	1,147,000		1,147,000		1,147,000
Other Real Estate, Gross	2,217,000		2,217,000		2,217,000
Real Estate Owned, Valuation Allowance					$ 1,070,000
SEC Schedule III, Real Estate, Write-down or Reserve, Amount	$ 0	$ 0	$ 0	$ 0