Note 6 - Segment Information (Details) - Net Sales for Geographic Areas (USD $)	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 20,788,764	$ 19,838,466
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	17,748,632	16,645,886
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	1,899,118	1,913,512
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 1,141,014	$ 1,279,068