Note 7 - Segment Information (Details) - Net Sales for Geographic Areas (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical locations	$ 19,703,607	$ 18,973,013	$ 39,542,073	$ 38,210,840
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical locations	16,432,956	15,741,570	33,078,842	31,937,964
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical locations	2,030,752	1,918,986	3,926,810	3,838,709
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical locations	$ 1,239,899	$ 1,312,457	$ 2,536,421	$ 2,434,167