Note 15 - Financial Instruments with Off-Balance Sheet Risk (Details) - Contractual Amount of Financial Instruments with Off-balance Sheet Risk - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	$ 63,683	$ 63,540
Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	119,201	111,147
Commitments to Extend Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	172,000	161,000
Commitments to Extend Credit [Member] | Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	61,188	60,731
Commitments to Extend Credit [Member] | Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	111,202	100,612
Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	10,500	13,300
Standby Letters of Credit [Member] | Fixed Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	2,495	2,809
Standby Letters of Credit [Member] | Variable Rate [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]
Off-balance Sheet Risk	$ 7,999	$ 10,535