Note 1 - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Net earnings used in the computation of basic and diluted earnings per share	$ 2,260,000	$ 2,043,000
Weighted average shares outstanding - basic (in shares)	13,927,063	13,584,922
Common stock equivalents (in shares)	741,595	963,162
Weighted average shares outstanding - diluted (in shares)	14,668,658	14,548,084
Net income (in dollars per share)	$ 0.16	$ 0.15
Net income (in dollars per share)	$ 0.15	$ 0.14