Note 9 - Basic and Diluted Earnings Per Common Share - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Net income (numerator)	$ 1,019,000	$ 306,000	$ 2,323,000	$ 741,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)	16,695,059	18,276,616	17,190,073	18,261,747
Add: dilutive effect of common stock options (in shares)	11,473	22,663		97,978
Diluted weighted average common shares outstanding (in shares)	16,706,532	18,299,279	17,190,073	18,359,725
Earnings per common share:
Basic (in dollars per share)	$ 0.06	$ 0.02	$ 0.14	$ 0.04
Diluted (in dollars per share)	$ 0.06	$ 0.02	$ 0.14	$ 0.04