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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2019
Sales to outside customers	$ 5,980,766	$ 6,365,352	$ 18,793,620	$ 24,259,037
Assets	21,948,575		21,948,575		$ 31,321,083
Assets Held for Sale International Subsidiaries	748,000		748,000		756,000
UNITED STATES
Sales to outside customers	4,749,000	4,120,000	14,718,000	17,911,000
Assets	13,215,000		13,215,000		19,668,000
MEXICO
Sales to outside customers	1,232,000	$ 2,245,000	4,076,000	$ 6,348,000
Assets	$ 7,986,000		$ 7,986,000		$ 10,897,000

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