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, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Jun. 30, 2019	Jun. 30, 2018
Net income		$ 3,644	$ 2,306	$ 4,839	$ 4,032	$ 3,618	$ 3,241	$ 5,950	$ 6,859
Weighted average shares - basic (in shares)	[1]	18,134				16,245		17,816	16,237
Effect of potentially dilutive common shares (in shares)	[2]	60				80		62	82
Weighted average number of common shares outstanding - diluted (in shares)		18,194				16,325		17,878	16,319
Earnings per share - basic (in dollars per share)		$ 0.20				$ 0.22		$ 0.33	$ 0.42
Earnings per share - diluted (in dollars per share)		$ 0.20				$ 0.22		$ 0.33	$ 0.42
Share-based Payment Arrangement, Option [Member]
Anti-dilutive options not included in diluted earnings per share calculation (in shares)
Restricted Stock [Member]
Anti-dilutive options not included in diluted earnings per share calculation (in shares)

[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.