Note 7 - Revenue Recognition - Net Sales by Product Category (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
Nutritional and Dietary Supplements [Member]
Net Revenues	6,814,003	7,144,604	15,657,153	15,641,954
Other Supplements [Member]
Net Revenues	266,013	140,293	683,242	140,293
Sales Aids, Membership Fees, and Other [Member]
Net Revenues	291,146	318,144	579,584	631,791
Freight Income [Member]
Net Revenues	446,707	479,881	1,004,802	999,822
Service, Other [Member]
Net Revenues	$ 198,691	$ 174,091	$ 374,444	$ 332,657