Note 2 - Common Stock Outstanding and Earnings Per Share - Basic and Diluted EPS (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended						6 Months Ended
		Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Jun. 30, 2020	Jun. 30, 2019
Net income		$ 3,847	$ 916	$ 4,369	$ 4,642	$ 3,644	$ 2,306	$ 4,763	$ 5,950
Weighted average shares - basic (in shares)	[1]	16,660				18,134		17,178	17,816
Effect of potentially dilutive common shares (in shares)	[2]	29				60		39	62
Weighted average number of common shares outstanding - diluted (in shares)		16,689				18,194		17,217	17,878
Earnings per share - basic (in dollars per share)		$ 0.23				$ 0.20		$ 0.28	$ 0.33
Earnings per share - diluted (in dollars per share)		$ 0.23				$ 0.20		$ 0.28	$ 0.33
Restricted Stock [Member]
Anti-dilutive securities not included in earnings per share calculation (in shares)		76				0		60	0

[1] Excludes unvested restricted shares because they do not have dividend or voting rights

[2] Represents the effects of the assumed exercise of stock options and vesting of non-participating restricted shares.