Note 6 - Loans and Allowance for Loan Losses - Analysis of Non-accruing Loans (Details) - USD ($)	Sep. 30, 2016	Dec. 31, 2015
Real Estate [Member] | Construction, Land Development and Other Land Loans [Member]
Total loans	$ 86,000	$ 339,000
Real Estate [Member] | Secured by 1-4 Family Residential Properties [Member]
Total loans	731,000	968,000
Real Estate [Member] | Secured by Multi-family Residential Properties [Member]
Total loans		0
Real Estate [Member] | Secured by Non-farm, Non-residential Properties [Member]
Total loans	61,000	213,000
Commercial and Industrial Loans [Member]
Total loans	22,000	47,000
Consumer Portfolio Segment [Member]
Total loans	1,366,000	1,535,000
Total loans	$ 2,266,000	$ 3,102,000