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Note 4 - Stock-based Compensation Plans (Details Textual)					1 Months Ended		3 Months Ended		12 Months Ended
	Mar. 01, 2023 shares	Jan. 03, 2023 shares	Feb. 04, 2022 $ / shares shares	Jul. 01, 2021 USD ($)	Jul. 31, 2022 shares	Apr. 30, 2021 shares	Mar. 31, 2023 USD ($) shares	Mar. 31, 2022 USD ($)	Dec. 31, 2022 shares	Jul. 10, 2019 shares
Share-based Payment Arrangement, Expense | $							$ 326,000	$ 433,000
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, Accelerated Vesting, Number (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, Accelerated Vesting, Number (in shares)			85,000
Restricted Stock Units (RSUs) [Member] | Vesting on March 1, 2023 [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Accelerated Vesting, Number (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 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
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)	158,673								158,673
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, Equity Instruments Other than Options, Vested 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
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] | Directors, Consultants and Employees [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)							1,837,043
Two Thousand Nineteen Equity Incentive Plan [Member] | Director [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)							65,200

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