Note 9 - Non-full Value Awards (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Outstanding at December 31, 2015 (in shares)				109,130
Outstanding at December 31, 2015 (in dollars per share)				$ 16.14
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		0	0	0	0
Exercised (in shares)				(27,945)
Exercised (in dollars per share)				$ 17.08
Forfeited (in shares)
Forfeited (in dollars per share)
Outstanding at June 30, 2016 (in shares)		81,185		81,185
Outstanding at June 30, 2016 (in dollars per share)		$ 15.81		$ 15.81
Outstanding at June 30, 2016				1 year 328 days
Outstanding at June 30, 2016	[1]	$ 330		$ 330

[1] The intrinsic value of a stock option is the difference between the market value of the underlying stock and the exercise price of the option.