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Note 13 - Related Party Transactions (Details Textual) - USD ($) |  | 12 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 11, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Jul. 01, 2019 | Dec. 31, 2018
Share Price (in dollars per share) | $ 3.32 |  |  |  |
Due from Related Parties, Current, Total |  | $ 100,000 | $ 1,387,131 |  |
Conversion of Related Party Debt to Equity [Member] |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 600,000 |  |  |  |
Debt Conversion, Converted Instrument, Shares Issued (in shares) | 181,000 |  |  |  |
Schwan Incorporated [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | 13,000 | 16,000 |  |
John H Schwan [Member] |  |  |  |  |
Due to Related Parties, Total |  | 1,123,769 | 1,058,486 |  |
John H Schwan [Member] | Promissory Note [Member] |  |  |  |  |
Due to Related Parties, Noncurrent, Total | $ 997,019 |  |  |  | $ 1,600,000
Debt Instrument, Interest Rate, Stated Percentage | 6.00% |  |  |  | 6.00%
Repayments of Related Party Debt |  | 0 | 0 |  |
Interest Expense, Related Party |  | 65,000 | 61,000 |  |
CTI Europe [Member] |  |  |  |  |
Long-term Debt, Gross |  | 0 | $ 14,000 |  |
Board of Directors Chairman [Member] |  |  |  |  |
Due from Related Parties, Current, Total |  |  |  | $ 1,300,000 |
Note Receivable, Reserve |  | $ 1,277,000 |  |  |

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