Note 1 - Reconciliation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Net earnings used in the computation of basic and diluted earnings per share	$ 3,075,042	$ 3,624,000	$ 5,335,443	$ 5,667,000
Weighted average shares outstanding - basic (in shares)	14,120,617	13,730,646	14,023,840	13,657,784
Common stock equivalents (in shares)	836,852	846,696	789,224	904,929
Weighted average shares outstanding - diluted (in shares)	14,957,469	14,577,342	14,813,064	14,562,713
Net income (in dollars per share)	$ 0.22	$ 0.26	$ 0.38	$ 0.41
Net income (in dollars per share)	$ 0.21	$ 0.25	$ 0.36	$ 0.39