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Note 8 - Geographic Segment Data - Net Sales to Outside Customers (Details) - USD ($)	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Net Sales	$ 7,416,168	$ 7,067,501
UNITED STATES
Net Sales	6,599,000	5,426,000
MEXICO
Net Sales	$ 817,000	$ 1,642,000

X

- Definition

Amount, including 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.

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