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Note 19 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands |  | 12 Months Ended
--- | --- | ---
Nov. 17, 2020 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Accounts Receivable, Related Parties |  | $ 100 | $ 200 |
Accounts Payable, Related Parties |  | $ 0 | 8 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 516,000 |  |
Share-based Payment Arrangement, Expense |  | $ 933 | 532 | $ 486
Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 700 | $ 500 | $ 400
Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  | 0 | 400,000 | 0
Share-based Payment Arrangement, Expense |  | $ 240 | $ 64 | $ 37
Share-based Payment Arrangement, Nonemployee [Member] | Eric Wu [Member] |  |  |  |
Share-based Payment Arrangement, Expense |  | $ 152 | $ 15 |
Partner and Senior Vice President of China Kington [Member] | Share-based Payment Arrangement, Nonemployee [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) | 300,000 |  | 300,000 |
Partner and Senior Vice President of China Kington [Member] | Share-based Payment Arrangement, Nonemployee [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Year) | 1 year |  |  |

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