Note 4 - Earnings Per Share - Computation of Basic and Diluted Earnings Per Share (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Employee Stock Option [Member]
Effect of dilutive securities:
Stock options (in shares)	28,231	39,376	28,993	39,067
Restricted Stock [Member]
Effect of dilutive securities:
Stock options (in shares)		1,714		1,647
Net income	$ 1,507,896	$ 1,765,485	$ 2,952,303	$ 3,619,897
Numerator for basic and diluted earnings per share	$ 1,507,896	$ 1,765,485	$ 2,952,303	$ 3,619,897
Basic (in shares)	10,212,933	10,198,733	10,212,137	10,198,733
Stock options (in shares)	28,231	41,090	28,993	40,714
Diluted (in shares)	10,241,164	10,239,823	10,241,130	10,239,447
Basic earnings per share (in dollars per share)	$ 0.15	$ 0.17	$ 0.29	$ 0.35
Diluted earnings per share (in dollars per share)	$ 0.15	$ 0.17	$ 0.29	$ 0.35