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Note 11 - Stock-based Compensation Plans (Details Textual)							1 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 ($)	Jul. 31, 2022 shares	Apr. 30, 2021 shares	Dec. 31, 2023 USD ($) 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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