Note 1 - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Net earnings used in the computation of basic and diluted earnings per share	$ 4,031,000	$ 3,368,000	$ 9,698,000	$ 8,493,000
Weighted average shares outstanding - basic (in shares)	13,833,561	13,375,566	13,716,376	13,237,438
Common stock equivalents (in shares)	752,127	628,636	853,995	498,056
Weighted average shares outstanding - diluted (in shares)	14,585,688	14,004,202	14,570,371	13,735,494
Net income per basic share (in dollars per share)	$ 0.29	$ 0.25	$ 0.71	$ 0.64
Net earnings (in dollars per share)	$ 0.28	$ 0.24	$ 0.67	$ 0.62