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Note 11 - Related Party Transactions (Details Textual) - USD ($) | 1 Months Ended | 6 Months Ended |  |
--- | --- | --- | --- | ---
Jan. 31, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Jul. 01, 2019 | Dec. 31, 2018
Legal Fees |  | $ 2,700 | $ 8,000 |  |
Due to Related Parties, Noncurrent, Total |  | 1,100,000 |  |  | $ 1,600,000
Interest Expense, Related Party |  | 15,000 | 16,000 |  |
CTI Europe [Member] |  |  |  |  |
Long-term Debt, Gross |  | 9,000 | $ 14,000 |  |
Board of Directors Chairman [Member] |  |  |  |  |
Due from Related Parties, Total |  |  |  | $ 1,387,000 |
Note Receivable, Reserve |  | $ 350,000 |  |  |
Conversion of Related Party Debt to Equity [Member] |  |  |  |  |
Debt Conversion, Original Debt, Amount | $ 600,000 |  |  |  |

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