Note 9 - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net income (numerator)	$ 507,000	$ 148,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)	17,669,331	18,299,933
Add: dilutive effect of common stock options (in shares)		199,639
Diluted weighted average common shares outstanding (in shares)	17,669,331	18,499,572
Earnings per common share:
Basic (in dollars per share)	$ 0.03	$ 0.01
Diluted (in dollars per share)	$ 0.03	$ 0.01