Note 7 - Revenue Recognition - Net Sales by Geographic Region (Details) - USD ($)		3 Months Ended		6 Months Ended
		Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Net Revenues		$ 8,016,560	$ 8,257,013	$ 18,299,225	$ 17,746,517
UNITED STATES
Net Revenues		6,087,586	5,904,605	13,930,021	13,016,378
Australia, New Zealand [Member]
Net Revenues		118,749	132,330	288,871	309,377
CANADA
Net Revenues		125,996	140,029	284,657	339,428
MEXICO
Net Revenues		124,554	152,569	253,175	288,595
Europe [Member]
Net Revenues	[1]	602,533	756,264	1,564,625	1,694,933
Asia [Member]
Net Revenues	[2]	$ 957,142	$ 1,171,216	$ 1,977,876	$ 2,097,806

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

[2] Asia consists of Philippines and Malaysia.