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Note 8 - Geographic Segment Data - Financial Information by Geographic Area (Details) - USD ($) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2019 | Mar. 31, 2018 | Dec. 31, 2018
Revenue from Contract with Customer, Including Assessed Tax | $ 12,536,389 | $ 13,979,177 |
Sales to outside customers | 39,705,058 |  | $ 38,760,834
UNITED STATES |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 8,760,000 | 9,738,000 |
Sales to outside customers | 23,472,000 |  | 25,354,000
Europe [Member] |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 1,275,000 | 1,362,000 |
Sales to outside customers | 3,366,000 |  | 3,052,000
MEXICO |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 2,081,000 | 2,186,000 |
Sales to outside customers | 11,406,000 |  | 9,476,000
UNITED KINGDOM |  |  |
Revenue from Contract with Customer, Including Assessed Tax | 420,000 | $ 693,000 |
Sales to outside customers | $ 1,461,000 |  | $ 879,000

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