Note 7 - Derivative Financial Instruments - Outstanding Undesignated Interest Rate Swap Contracts (Details) - Not Designated as Hedging Instrument [Member] - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2016	Dec. 31, 2015
Receiving [Member]
Notional amount	$ 25,657	$ 10,788
Weighted average maturity (years)	7 years 146 days	6 years 328 days
Fair value	$ (1,282)	$ (461)
Paying [Member]
Notional amount	$ 25,657	$ 10,788
Weighted average maturity (years)	7 years 146 days	6 years 328 days
Fair value	$ 1,282	$ 461