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Note 14 - Subsequent Events (Details Textual) - USD ($) $ / shares in Units, $ in Thousands |  |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | --- | ---
Jul. 21, 2023 | Jul. 18, 2023 | Jun. 30, 2023 | Jun. 30, 2023 | Jun. 30, 2022
Stock Issued During Period, Value, New Issues |  |  | $ 32 | $ 64 |
Proceeds from Issuance of Common Stock |  |  |  | $ 2,784 | $ 4,588
Subsequent Event [Member] | Yulho Co, Ltd. [Member] | Yulho License Agreement [Member] |  |  |  |  |
Agreement, Period of Execution (Day) |  | 75 days |  |  |
Subsequent Event [Member] | Yulho Offering [Member] | Yulho Co, Ltd. [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) |  | 4,545,455 |  |  |
Shares Issued, Price Per Share (in dollars per share) |  | $ 1.10 |  |  |
Stock Issued During Period, Value, New Issues |  | $ 5,000 |  |  |
Subsequent Event [Member] | July 2023 Public Offering [Member] |  |  |  |  |
Stock Issued During Period, Shares, New Issues (in shares) | 18,193,000 |  |  |  |
Shares Issued, Price Per Share (in dollars per share) | $ 1.10 |  |  |  |
Proceeds from Issuance of Common Stock | $ 18,500 |  |  |  |

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