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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019
Sales to outside customers	$ 7,067,501	$ 8,680,017
Assets	26,843,855		$ 31,321,083
Assets Held for Sale International Subsidiaries	881,000		756,000
UNITED STATES
Sales to outside customers	5,426,000	6,600,000
Assets	17,770,000		19,668,000
MEXICO
Sales to outside customers	1,642,000	$ 2,080,000
Assets	$ 8,193,000		$ 10,897,000

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