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Note 2 - Summary of Significant Accounting Policies (Details Textual) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Mar. 31, 2020 USD ($)
Number of Entities Consolidated as Variable Interest Entities | 3 |  |
Deconsolidation, Gain (Loss), Amount | $ 218,534 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 730,000 | 82,000 |
Interest Costs Capitalized | 12,000 | 14,000 |
Property, Plant and Equipment, Net, Ending Balance | 2,531,072 | 3,720,912 |
Goodwill, Impairment Loss | 1,400,000 | 0 |
Research and Development Expense, Total | 287,000 | 375,000 |
Advertising Expense | 80,000 | $ 171,000 |
Ziploc Related Long-lived Assets [Member] |  |  |
Property, Plant and Equipment, Net, Ending Balance | 685,000 |  |
Property, Plant, and Equipment, Salvage Value | 300,000 |  |
Depreciation, Total | 143,000 |  |
Ziploc Related Long-lived Assets [Member] | Forecast [Member] |  |  |
Property, Plant and Equipment, Net, Ending Balance |  |  | $ 0
One of Ziploc Related Long-lived Assets Used in Other Products [Member] |  |  |
Property, Plant and Equipment, Net, Ending Balance | $ 100,000 |  |

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