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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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