Note 16 - Segment Information - Net Sales by Product Category (Details) - USD ($)	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018
Net sales	$ 35,055,315	$ 36,115,741
Nutritional and Dietary Supplements [Member]
Net sales	29,822,879	32,670,362
Other Supplements [Member]
Net sales	1,223,977
Sales Aids, Membership Fees, and Other [Member]
Net sales	1,251,677	1,247,807
Freight Income [Member]
Net sales	1,973,320	2,197,572
Product and Service, Other [Member]
Net sales	$ 783,462

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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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration