Note 9 - 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, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net income (numerator)	$ 797,000	$ 288,000	$ 1,304,000	$ 436,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)	17,211,268	18,208,947	17,440,299	18,254,188
Add: dilutive effect of common stock options (in shares)		99,859		134,040
Diluted weighted average common shares outstanding (in shares)	17,211,268	18,308,806	17,440,299	18,388,228
Earnings per common share:
Basic (in dollars per share)	$ 0.05	$ 0.02	$ 0.07	$ 0.02
Diluted (in dollars per share)	$ 0.05	$ 0.02	$ 0.07	$ 0.02