Note 7 - Segment Information (Details) - Net Sales for Geographic Areas (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 19,417,234	$ 18,524,604	$ 58,959,307	$ 56,735,444
UNITED STATES
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	16,219,193	15,466,317	49,298,035	47,404,281
CANADA
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	1,908,966	1,889,696	5,835,776	5,728,405
All Other Countries [Member]
Revenues from External Customers and Long-Lived Assets [Line Items]
Geographical	$ 1,289,075	$ 1,168,591	$ 3,825,496	$ 3,602,758