Note 6 - Segment Information (Details) - Net Sales for Geographic Areas (USD $)	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographic locations	$ 19,838,466	$ 19,237,827
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographic locations	16,645,886	16,196,394
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographic locations	1,913,512	1,919,723
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographic locations	$ 1,279,068	$ 1,121,710