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Note 24 - Subsequent Events (Details Textual) - USD ($) |  | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Mar. 16, 2021 | Oct. 31, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Jan. 31, 2021 | Dec. 31, 2019
Proceeds from Advances on Proposed Equity Financing |  | $ 1,500,000 |  |  |  |
Preferred Stock, No Par Value (in dollars per share) |  |  |  | $ 0 |  | $ 0
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  |  | 391,308 |  |
Subsequent Event [Member] |  |  |  |  |  |
Stock Issued During Period, Shares, Warrants Exercised (in shares) |  |  | 103,104 |  |  |
Subsequent Event [Member] | Benchmark Investments, Inc. v. Yunhong CTI Ltd [Member] |  |  |  |  |  |
Loss Contingency, Damages Sought, Value | $ 500,000 |  |  |  |  |
Subsequent Event [Member] | Series C Preferred Stock [Member] |  |  |  |  |  |
Equity Financing Agreement, Maximum Number of Shares to Purchase (in shares) |  |  |  |  | 170,000 |
Preferred Stock, No Par Value (in dollars per share) |  |  |  |  | $ 0 |
Convertible Preferred Stock, Shares Issued upon Conversion (in shares) |  |  |  |  | 10 |
Equity Financing Agreement, Purchase Price (in dollars per share) |  |  |  |  | $ 0.88 |
Equity Financing Agreement, Aggregate Gross Proceeds |  |  |  |  | $ 1,500,000 |

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