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Note 12 - Related Party Transactions (Details Textual) - USD ($) $ in Thousands |  |  |  | 12 Months Ended
--- | --- | --- | --- | ---
Jan. 12, 2022 | Nov. 04, 2021 | May 07, 2020 | Dec. 31, 2022 | Dec. 31, 2021
Prepaid Expense, Current, Total |  |  |  | $ 4,248 | $ 5,598
Mr. McAfee [Member] |  |  |  |  |
Accrued Liabilities, Current, Total |  |  |  | 0 | 300
Various Board Members [Member] |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  | 400 | 400
Restricted Stock, Value, Shares Issued Net of Tax Withholdings |  |  |  | 900 |
Employment Agreements and Expense Reimbursements [Member] | Mr. McAfee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 400 | 400
Expensed Employee Reimbursements [Member] | Mr. McAfee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 300 | 15
Prepayments [Member] | Mr. McAfee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | 200 |
Prepaid Expense, Current, Total |  |  |  | 100 |
Stock Option Expenses [Member] | Executive Officer [Member] |  |  |  |  |
Related Party Transaction, Due from (to) Related Party, Total |  |  |  | 106 |
Guarantee Fee [Member] | Mr. McAfee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  | $ 400 | $ 600 |  |
Guarantee Fee Percentage On Outstanding Balance |  |  | 0.10% |  |
One-time Guarantee Fee [Member] | Mr. McAfee [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction | $ 2,000 |  |  |  |
Board Compensation Fees [Member] | Various Board Members [Member] |  |  |  |  |
Related Party Transaction, Amounts of Transaction |  |  |  | $ 300 | $ 200

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