Note 9 - Revenue Recognition - Net Sales by Geographic Region (Details) - USD ($)		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018
Net Revenues		$ 9,489,504	$ 10,003,239
UNITED STATES
Net Revenues		7,111,773	7,670,061
Australia, New Zealand [Member]
Net Revenues		177,048	231,928
CANADA
Net Revenues		199,399	242,120
MEXICO
Net Revenues		136,026	107,371
Europe [Member]
Net Revenues	[1]	938,668	1,164,884
Asia [Member]
Net Revenues	[2]	$ 926,590	$ 586,875

[1] Europe consists of United Kingdom, Ireland, France, Germany, Austria, and the Netherlands.

[2] Asia consists of Philippines, Malaysia, and Singapore.