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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Sales to outside customers | $ 5,745,353 | $ 9,202,406 | $ 12,812,854 | $ 17,882,423 |
Assets | 24,259,486 |  | 24,259,486 |  | $ 31,321,083
Assets Held for Sale International Subsidiaries | 788,000 |  | 788,000 |  | 756,000
UNITED STATES |  |  |  |  |
Sales to outside customers | 4,543,000 | 7,180,000 | 9,969,000 | 13,779,000 |
Assets | 15,163,000 |  | 15,163,000 |  | 19,668,000
MEXICO |  |  |  |  |
Sales to outside customers | 1,202,000 | $ 2,022,000 | 2,844,000 | $ 4,103,000 |
Assets | $ 8,308,000 |  | $ 8,308,000 |  | $ 10,897,000

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