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		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Net income (numerator)	$ 288,000	$ 895,000	$ 436,000	$ 1,164,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)	18,208,947	18,321,432	18,254,188	18,594,118
Add: dilutive effect of common stock options (in shares)	99,859	276,034	134,040	247,900
Diluted weighted average common shares outstanding (in shares)	18,308,806	18,597,466	18,388,228	18,842,018
Earnings per common share:
Basic (in dollars per share)	$ 0.02	$ 0.05	$ 0.02	$ 0.06
Diluted (in dollars per share)	$ 0.02	$ 0.05	$ 0.02	$ 0.06