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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018	Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax	$ 8,329,043	$ 10,128,436	$ 30,297,835	$ 36,508,220
Assets	31,973,840		31,973,840		$ 38,760,834
Assets Held for Sale International Subsidiaries	1,305,000		1,305,000		3,672,000
UNITED STATES
Revenue from Contract with Customer, Including Assessed Tax	5,984,000	7,732,000	23,468,000	29,549,000
Assets	19,409,000		19,409,000		25,613,000
MEXICO
Revenue from Contract with Customer, Including Assessed Tax	2,345,000	$ 2,396,000	6,830,000	$ 6,959,000
Assets	$ 11,260,000		$ 11,260,000		$ 9,476,000

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