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Note 16 - Stock-based Compensation (Details Textual) - USD ($) $ in Thousands |  |  | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 17, 2022 | Mar. 23, 2022 | May 31, 2022 | Feb. 28, 2022 | May 31, 2021 | May 31, 2022 | May 31, 2021 | Jan. 07, 2022 | Nov. 30, 2021 | Nov. 19, 2020
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  | 300,000,000 |  |  | 300,000,000 |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 800 |  | $ 800 | $ 1,600 | $ 1,600 |  |  |
Percentage of RSUs Exchanged for Stock Options |  | 50.00% |  |  |  |  |  |  |  |
Number of RSUs Exchanged for Stock Options (in shares) |  | 778,750 |  |  |  |  |  |  |  |
Fair Value Adjustment of Obligation to Issue Stock Options |  |  |  |  |  | $ (300) |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) |  |  |  |  |  | 16,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Option, Cost Not yet Recognized, Amount |  |  | 300 |  |  | $ 300 |  |  |  |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  |  |  |  | $ 1,300 | $ 1,600 |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  |  | 626 | 1,573,500 |  |  |
Share-Based Payment Arrangement, Plan Modification, Incremental Cost |  |  | 800 |  |  | $ 800 |  |  |  |
Share-Based Payment Arrangement, Plan Modification, Reclassified from Paid in Capital to Liability |  |  | 1,000 |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in shares) |  |  |  |  |  | 3,874 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) |  |  |  |  |  | 25,000 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Excluding Option, Cost Not yet Recognized, Amount |  |  | $ 3,100 |  |  | $ 3,100 |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year 7 months 6 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 122,500 |  |  | 122,500 |  | 200,000 |  |
Restricted Stock Units (RSUs) [Member] | CTO [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 500 |  |  | $ 1,000 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  | 200,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Former Employee [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Plan Modification, Incremental Cost |  |  | 400 |  |  | 400 |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Forfeitures in Period (in shares) |  |  |  | 25,000 |  |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Former Director [Member] |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Non-Option Equity Instruments, Exercised (in shares) |  |  |  | 3,873 |  |  |  |  |  |
Modified Rewards [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 300 |  |  | $ 300 |  |  |  |
Share-Based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition (Year) |  |  |  |  |  | 1 year 9 months 18 days |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Available for Grant (in shares) |  |  | 994,750 |  |  | 994,750 |  |  |  |
Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 50,000,000 |  |  |  |  |  |  |  |  |
The 2017 Stock Option Plan (2017 Plan) [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 1,899,327 |
The 2020 Equity Incentive Plan (2020 Plan) [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  | 2,500,000
The 2020 Equity Incentive Plan (2020 Plan) [Member] | Employees and Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures, Total (in shares) |  |  |  |  |  | 0 | 29,000 |  |  |
The 2020 Equity Incentive Plan (2020 Plan) [Member] | Share-Based Payment Arrangement, Option [Member] | Employees and Directors [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Expense |  |  | $ 50 |  | $ 90 | $ 100 | $ 200 |  |  |
The 2020 Equity Incentive Plan (2020 Plan) [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) | 3,800,000 |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Additional Shares Authorized (in shares) | 1,300,000 |  |  |  |  |  |  |  |  |

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- Definition The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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