Note 16 - Disclosures About Fair Value of Financial Instruments (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015
Real Estate Acquired Through Foreclosure	$ 26,895,000	$ 44,820,000
Impaired Financing Receivable, Related Allowance	680,000	2,831,000
Collateral Dependent Loans [Member]
Impaired Financing Receivable, Related Allowance	$ 2,384,000	1,136,000
Commercial and Residential Real Estate Collateral [Member] | Minimum [Member]
Fair Value Percentage Of Collateral Discount	10.00%
Commercial and Residential Real Estate Collateral [Member] | Maximum [Member]
Fair Value Percentage Of Collateral Discount	40.00%
Foreclosed Assets Not Covered By FDIC Loss Share [Member]
Real Estate Acquired Through Foreclosure	$ 26,900,000	$ 44,900,000
Special Mention Or Worse [Member]
Collateral Dependent Loans Amount At Which All Loans Are Tested	$ 1,500,000