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Note 12 - Acquisition - Unaudited Supplemental Pro-forma Data (Details) - BS Plastic [Member] - USD ($) | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Revenue | $ 15,139,607 | $ 14,358,283
Net income attributable to common shareowners from continuing operations | $ (3,754,883) | $ (4,370,052)
Basic earnings per share of common stock from continuing operations (in dollars per share) | $ (0.24) | $ (0.42)

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