Note 4 - Earnings Per Share - Computation 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
Employee Stock Option [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)	23,442	36,294	27,036	38,133
Restricted Stock [Member]
Effect of dilutive securities:
Effect of dilutive securities (in shares)		1,405		1,565
Net income	$ 1,111,344	$ 1,628,562	$ 4,063,647	$ 5,248,459
Numerator for basic and diluted earnings per share	$ 1,111,344	$ 1,628,562	$ 4,063,647	$ 5,248,459
Basic (in shares)	10,175,650	10,203,711	10,199,841	10,200,411
Effect of dilutive securities (in shares)	23,442	37,699	27,036	39,698
Diluted (in shares)	10,199,092	10,241,410	10,226,877	10,240,109
Basic earnings per share (in dollars per share)	$ 0.11	$ 0.16	$ 0.40	$ 0.51
Diluted earnings per share (in dollars per share)	$ 0.11	$ 0.16	$ 0.40	$ 0.51