Note 2 - Reconciliation of Net Income and Number of Shares Used in Computations of Basic and Diluted EPS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Net income (numerator)	$ 1,041,000	$ 2,742,000
Shares (denominator):
Basic weighted average common shares outstanding (in shares)	18,197,109	18,414,775
Add: Dilutive effect of common stock options (in shares)	41,255	309,410
Diluted weighted average common shares outstanding (in shares)	18,238,364	18,724,185
Earnings per common share:
Basic (in dollars per share)	$ 0.06	$ 0.15
Diluted (in dollars per share)	$ 0.06	$ 0.15