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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax | $ 12,406,840 | $ 15,984,726 | $ 24,943,229 | $ 29,963,903 |
Assets | 35,226,695 |  | 35,226,695 |  | $ 38,760,834
UNITED STATES |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 9,095,000 | 12,075,000 | 17,855,000 | 21,813,000 |
Assets | 20,839,000 |  | 20,839,000 |  | 25,354,000
Europe [Member] |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,083,000 | 1,275,000 | 2,358,000 | 2,637,000 |
Assets | 2,118,000 |  | 2,118,000 |  | 3,052,000
MEXICO |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,022,000 | 2,378,000 | 4,103,000 | 4,564,000 |
Assets | 11,490,000 |  | 11,490,000 |  | 9,476,000
UNITED KINGDOM |  |  |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 207,000 | $ 257,000 | 627,000 | $ 950,000 |
UKRAINE |  |  |  |  |
Assets | $ 780,000 |  | $ 780,000 |  | $ 879,000

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