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Note 1 - Nature of the Business (Details Textual) $ in Thousands, ¥ in Millions | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jul. 03, 2019 USD ($) | Jul. 03, 2019 CNY (¥) | Dec. 31, 2023 USD ($) shares | Dec. 31, 2019 USD ($) | Dec. 31, 2019 CNY (¥)
Wanchunbulin [Member] |  |  |  |  |
Investment Agreement Amount | $ 14,537 | ¥ 100 |  |  |
Proceeds From Noncontrolling Interest, Percent | 4.76% | 4.76% |  |  |
Proceeds from Noncontrolling Interests |  |  |  | $ 10,083 | ¥ 70
Jefferies [Member] |  |  |  |  |
Proceeds from Issuance of Common Stock | $ |  |  | $ 13,185 |  |
Stock Issued During Period, Shares, New Issues (in shares) | shares |  |  | 630,228 |  |

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