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Note 19 - Product and Geographic Segment Data - Financial Information By Geographic Area (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017
Sales to outside customers | $ 55,591,102 | $ 56,236,560
Total assets | 38,760,834 | 39,984,038
UNITED STATES |  |
Sales to outside customers | 40,554,000 | 41,165,000
Total assets | 25,354,000 | 27,784,000
UNITED KINGDOM |  |
Sales to outside customers | 1,438,000 | 1,908,000
Total assets | 879,000 | 923,000
Europe [Member] |  |
Sales to outside customers | 4,731,000 | 4,142,000
Total assets | 3,052,000 | 2,989,000
MEXICO |  |
Sales to outside customers | 8,868,000 | 9,022,000
Total assets | $ 9,476,000 | $ 8,288,000

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