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Note 11 - Stock-based Compensation Plans (Details Textual) |  |  |  |  |  |  | 1 Months Ended | 12 Months Ended |  |
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Mar. 01, 2024 shares | Jul. 01, 2023 shares | Mar. 01, 2023 shares | Jan. 03, 2023 shares | Feb. 04, 2022 $ / shares shares | Jul. 01, 2021 USD ($) | Jul. 31, 2022 shares | Apr. 30, 2021 shares | Dec. 31, 2023 USD ($) shares | Dec. 31, 2022 shares | Dec. 31, 2021 shares | Jul. 10, 2019 shares
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  |  | 603,884 | 219,878 |  |
Water Supply Agreement, Number of Acre-feet of Water Per Annum To Customer |  |  |  |  |  |  |  | 9,500 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  |  |  |  |  |  |  | 468,116 | 310,501 |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) |  |  |  |  |  |  |  |  | 90,315 | (0) |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) |  |  |  |  |  |  |  |  | 589,077 | 543,624 | 634,247 |
Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  | 2,333,739 |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number (in shares) |  |  | 170,000 |  | 170,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  |  | 170,000 |  |  |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  |  |  |  |  |  | $ 315,000 |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting Upon Completion of Final Binding Water Supply Agreement [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number (in shares) |  |  |  |  | 85,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Forfeited in Period (in shares) |  |  |  |  |  |  |  |  | 85,000 |  |  |
Restricted Stock Units (RSUs) [Member] | Vesting Upon Completion of Final Binding Water Supply Agreement [Member] | Subsequent Event [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) | 85,000 |  |  |  |  |  |  |  |  |  |  |
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 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 |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested 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, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  |  |  |  |  | 255,000 |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares) |  |  | 102,871 |  |  |  |  |  |  | 158,673 |  |
Performance Stock Units [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  | 450,000 |  |  |  |  |  |  |
Share-Based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount | $ |  |  |  |  |  |  |  |  | $ 315,000 |  |  |
Performance Stock Units [Member] | Vesting Upon Price Hurdle of $7 Per Share [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  | 200,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share) | $ / shares |  |  |  |  | $ 7 |  |  |  |  |  |  |
Performance Stock Units [Member] | Vesting Upon Price Hurdle of $9 Per Share [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  | 150,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share) | $ / shares |  |  |  |  | $ 9 |  |  |  |  |  |  |
Performance Stock Units [Member] | Vesting Upon Price Hurdle of $11 Per Share [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share) | $ / shares |  |  |  |  | $ 11 |  |  |  |  |  |  |
Performance Stock Units [Member] | Vesting Upon Price Hurdle of $13 Per Share [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares) |  |  |  |  | 50,000 |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share) | $ / shares |  |  |  |  | $ 13 |  |  |  |  |  |  |
A Consultant [Member] | Restricted Stock Units (RSUs) [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  | 400,000 |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Nonvested, Number (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |  |
A Consultant [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Upon Completion of Certain Milestone [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 200,000 |  |  |  |  |  |  |  |  |  |
A Consultant [Member] | Restricted Stock Units (RSUs) [Member] | Vesting on October 1, 2023 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |
A Consultant [Member] | Restricted Stock Units (RSUs) [Member] | Vesting on February 1, 2024 [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares) |  | 100,000 |  |  |  |  |  |  |  |  |  |
Two Thousand Nineteen Equity Incentive Plan [Member] |  |  |  |  |  |  |  |  |  |  |  |
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares) |  |  |  |  |  |  |  |  |  |  |  | 2,700,000
Two Thousand Nineteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Yearly [Member] |  |  |  |  |  |  |  |  |  |  |  |
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ |  |  |  |  |  | $ 75,000 |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  | 25,000 |  |  |  |  |  |
Two Thousand Nineteen Equity Incentive Plan [Member] | Outside Director [Member] | Accrues Quarterly [Member] |  |  |  |  |  |  |  |  |  |  |  |
Salary and Wage, Officer, Excluding Cost of Good and Service Sold | $ |  |  |  |  |  | 18,750 |  |  |  |  |  |
Share-Based Payment Arrangement, Expense | $ |  |  |  |  |  | $ 6,250 |  |  |  |  |  |

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