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Note 8 - Geographic Segment Data - Assets by Geographic Areas (Details) - USD ($)
Jun. 30, 2021
Dec. 31, 2020
Assets $ 24,483,243 $ 21,550,971
Assets Held for Sale International Subsidiaries 0 294,219
UNITED STATES    
Assets 15,801,575 12,458,706
MEXICO    
Assets $ 8,681,668 $ 8,798,046