Note 7 - Segment Information - Net Sales for Geographic Areas (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
UNITED STATES
United States	$ 16,836,732	$ 16,432,956	$ 34,585,363	$ 33,078,842
CANADA
United States	1,852,181	2,030,752	3,738,766	3,926,810
All Other Countries [Member]
United States	1,084,615	1,239,899	2,238,163	2,536,421
United States	$ 19,773,528	$ 19,703,607	$ 40,562,292	$ 39,542,073