Note 7 - Revenue Recognition - Net Sales by Geographic Region (Details) - USD ($)		3 Months Ended		9 Months Ended
		Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Net Revenues		$ 8,668,344	$ 9,148,865	$ 26,967,569	$ 26,895,382
UNITED STATES
Net Revenues		6,682,473	6,842,640	20,612,493	19,859,018
Australia, New Zealand [Member]
Net Revenues		148,012	135,123	436,883	444,500
CANADA
Net Revenues		127,791	139,991	412,448	479,418
MEXICO
Net Revenues		166,476	155,847	419,651	444,442
Europe [Member]
Net Revenues	[1]	628,810	727,038	2,193,436	2,421,971
Asia [Member]
Net Revenues	[2]	$ 914,782	$ 1,148,226	$ 2,892,658	$ 3,246,033

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

[2] Asia consists of Philippines and Malaysia.