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Note 9 - Stock-based Compensation Plans and Warrants (Details Textual) |  |  | 1 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Jul. 01, 2021 USD ($) | Dec. 18, 2009 shares | Apr. 30, 2021 shares | Dec. 31, 2021 USD ($) shares | Dec. 31, 2020 USD ($) shares | Dec. 31, 2019 shares | Jul. 10, 2019 shares
Share-based Payment Arrangement, Expense | $ |  |  |  | $ 4,747,000 |  | $ 2,096,000 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number, Ending Balance (in shares) |  |  |  | 0 | [1] | 115,000 | 492,500 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period (in shares) |  |  |  | 0 |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross (in shares) |  |  |  | 0 |  | 0 |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  |  | 850,729 |  | 253,654 |  |
Water Supply Agreement, Number of Acre-feet of Water Per Annum To Customer |  |  | 9,500 |  |  |  |  |
Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Payment Arrangement, Expense | $ |  |  |  | $ 0 |  | $ 0 |  |
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 |  |  |  |  |
Restricted Stock Units (RSUs) [Member] | Share-based Payment Arrangement, Employee [Member] | April 2021 RSU Grant [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares) |  |  | 850,000 |  |  |  |  |
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 |  |  |  |  |
Two Thousand Nine Equity Incentive Plan [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized (in shares) |  | 850,000 |  |  |  |  |  |
Two Thousand Nine Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period (Year) |  | 10 years |  |  |  |  |  |
Two Thousand Nine Equity Incentive Plan [Member] | Share-based Payment Arrangement, Option [Member] | Maximum [Member] |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period (Month) |  | 24 months |  |  |  |  |  |
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 |  |  |  | 1,200,000
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 |  |  |  |  |  |  |
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) |  |  |  | 1,120,292 |  |  |  |
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 |  |  |  |
[1] | Exercise prices vary from $9.88 to $12.51, and expiration dates vary from April 2021 to December 2021.

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