Note 11 - Segment Information (Details) - Net Sales for Geographic Areas (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 83,430,912	$ 78,284,585	$ 72,720,624
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	69,791,099	65,371,652	61,041,650
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	6,342,896	8,004,320	7,496,840
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 5,296,917	$ 4,908,613	$ 4,182,134