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		9 Months Ended		12 Months Ended
		Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016	Dec. 31, 2016
Net income		$ 2,876	$ 2,366	$ 7,337	$ 2,962	$ 5,259
Weighted average shares - basic (in shares)		16,191	13,369	14,884	13,366
Effect of potentially dilutive common shares (1) (in shares)	[1]	97	70	100	46
Weighted average number of common shares outstanding - diluted (in shares)		16,288	13,439	14,984	13,412
Basic (in dollars per share)		$ 0.18	$ 0.18	$ 0.49	$ 0.22
Diluted (in dollars per share)		$ 0.18	$ 0.18	$ 0.49	$ 0.22
Equity Option [Member]
Anti-dilutive options not included in diluted earnings per share calculation (in shares)		70	74	74	111
Restricted Stock [Member]
Anti-dilutive options not included in diluted earnings per share calculation (in shares)		42		43	41

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