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Note 4 - Stock-based Compensation Plans (Details Textual) $ in Thousands | 1 Months Ended | 9 Months Ended
--- | --- | ---
Apr. 30, 2021 shares | Sep. 30, 2021 USD ($) shares | Sep. 30, 2020 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  | 15,000 |
Share-based Payment Arrangement, Expense | $ |  | $ 4,100 | $ 1,800
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  | 0 |
Water Supply Agreement, Number of Acre-feet of Water Per Annum To Customer | 9,500 |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ |  | $ 1,184 | (0)
Two Thousand Nineteen Equity Incentive Plan [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 1,200,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant (in shares) |  | 82,404 |
Two Thousand Nineteen Equity Incentive Plan [Member] | Directors, Consultants and Employees [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 1,117,596 |
Two Thousand Nineteen Equity Incentive Plan [Member] | Director [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 14,243 |
Share-based Payment Arrangement, Option [Member] |  |  |
Share-based Payment Arrangement, Expense | $ |  | $ 0 | $ 0
Restricted Stock Units (RSUs) [Member] |  |  |
Payment, Tax Withholding, Share-based Payment Arrangement | $ |  | $ 1,200 |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 825,000 |  |
Milestone RSUs [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 510,000 |  |
Milestone RSUs [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 255,000 |  |
Milestone RSUs [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 255,000 |  |
Non-milestone Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 315,000 |  |
Non-milestone Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche One [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 60,000 |  |
Non-milestone Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | Share-based Payment Arrangement, Tranche Two [Member] |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Shares Issued in Period (in shares) |  | 158,673 |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) | 255,000 |  |

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