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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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