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Note 14 - Variable Interest Entities ("VIE") and Transactions - Condensed Balance Sheet (Details) - USD ($) | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Current Assets | $ 33,010,734 | $ 32,291,485
Property, plant and equipment, net | 3,814,981 | 4,556,581
Total assets | 38,760,834 | 39,984,038
Variable Interest Entity, Primary Beneficiary, Aggregated Disclosure [Member] |  |
Current Assets | 490,000 | 608,000
Property, plant and equipment, net | 200,000 | 231,000
Other noncurrent assets | 800,000 | 740,000
Total assets | 1,490,000 | 1,579,000
Long-term Debt, Total | 2,133,000 | 2,062,000
Total liabilities | $ 2,133,000 | $ 2,062,000

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