Note 9 - Revenue Recognition - Net Sales by Product Category (Details) - USD ($)	3 Months Ended	9 Months Ended
Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Net Revenues	$ 9,148,865	$ 8,337,045	$ 26,895,382	$ 26,800,025
Nutritional and Dietary Supplements [Member]
Net Revenues	8,072,320	7,514,349	23,854,568	24,190,379
Sales Aids, Membership Fees, and Other [Member]
Net Revenues	323,621	303,177	955,411	939,124
Freight Income [Member]
Net Revenues	521,192	519,519	1,521,014	1,670,522
Service, Other [Member]
Net Revenues	$ 231,732		$ 564,389

Amount, excluding tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

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