Note 1 - Nature of Operations and Summary of Significant Accounting Policies (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2019
Cash Reserve Deposit Required and Made	$ 1,082,000
Capital Conservation Buffer	0.625%	0.00%
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount	68,500	88,500	131,500
Scenario, Forecast [Member]
Capital Conservation Buffer				2.50%