Note 7 - Revenue Recognition - Net Sales by Product Category (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
Nutritional and Dietary Supplements [Member]
Net Revenues	7,367,492	7,400,530	23,024,645	23,042,485
Other Supplements [Member]
Net Revenues	289,982	671,790	973,224	812,083
Sales Aids, Membership Fees, and Other [Member]
Net Revenues	277,913	323,621	857,497	955,411
Freight Income [Member]
Net Revenues	489,479	521,192	1,494,281	1,521,014
Service, Other [Member]
Net Revenues	$ 243,478	$ 231,732	$ 617,922	$ 564,389