Note 12 - Net Sales for Geographic Areas (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
UNITED STATES
Net sales	$ 72,061,009	$ 69,791,099	$ 65,371,652
CANADA
Net sales	7,543,468	8,342,896	8,004,320
All Other Countries [Member]
Net sales	4,556,723	5,296,917	4,908,613
Net sales	$ 84,161,200	$ 83,430,912	$ 78,284,585