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Note 4 - Stock-based Compensation Plans (Details Textual)							1 Months Ended					3 Months Ended		12 Months Ended
	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 ($)	Apr. 30, 2024 $ / shares shares	Jan. 31, 2024 shares	Mar. 31, 2023 shares	Jul. 31, 2022 shares	Apr. 30, 2021 shares	Mar. 31, 2024 USD ($) shares	Mar. 31, 2023 USD ($)	Dec. 31, 2023 shares	Dec. 31, 2022 shares	Jul. 10, 2019 shares
Share-based Payment Arrangement, Expense \| $												$ 1,259,000	$ 326,000
Water Supply Agreement, Number of Acre-feet of Water Per Annum To Customer											9,500
Restricted Stock Units (RSUs) [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Number of Shares Authorized (in shares)												2,350,149
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
Restricted Stock Units (RSUs) [Member] \| Vesting Upon Completion of Final Binding Water Supply Agreement [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)	62,624
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, Vested in Period (in shares)					85,000							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] \| 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		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, Shares Issued in Period (in shares)									102,871						158,673
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)											255,000
Performance Stock Units [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Non-Option Equity Instruments, Granted (in shares)					450,000
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
Chief Executive Officer [Member] \| Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							1,600,000
Chief Executive Officer [Member] \| Restricted Stock Units (RSUs) [Member] \| Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							700,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)							3 years
Chief Executive Officer [Member] \| Performance Stock Units [Member] \| Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							600,000
Chief Executive Officer [Member] \| Performance Stock Units [Member] \| Vesting Upon Price Hurdle of $13 Per Share [Member] \| Subsequent Event [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)							300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vesting, Price Hurdle (in dollars per share) \| $ / shares							$ 15
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						300,000
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Vested in Period (in shares)								100,000
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
Two Thousand Nineteen Equity Incentive Plan [Member] \| Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)												46,744