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Note 4 - Stock-based Compensation Plans (Details Textual)
1 Months Ended 3 Months Ended 9 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
Jul. 01, 2021
USD ($)
Sep. 30, 2024
shares
Apr. 30, 2024
$ / shares
shares
Jan. 31, 2024
shares
Mar. 31, 2023
shares
Jul. 31, 2022
shares
Apr. 30, 2021
shares
Mar. 31, 2024
shares
Sep. 30, 2024
USD ($)
shares
Sep. 30, 2023
USD ($)
Dec. 31, 2023
shares
Dec. 31, 2022
shares
Jul. 10, 2019
shares
Share-based Payment Arrangement, Expense | $                           $ 3,566,000 $ 1,142,000      
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)             4,583,847             4,583,847        
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                          
Chief Executive Officer [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]                                    
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]                                    
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]                                    
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                    
Chief Operating Officer [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)             275,000                      
Chief Operating Officer [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Over Period From September 2024 to September 2027 [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             137,500                      
Share-Based Compensation Arrangement by Share-Based Payment Award, Award Vesting Period (Year)             3 years                      
Chief Operating Officer [Member] | Restricted Stock Units (RSUs) [Member] | Vesting Upon Achievement of Milestones [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period (in shares)             137,500                      
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)                           300,000        
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)                                   5,200,000
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] | Director [Member]                                    
Share-Based Compensation Arrangement by Share-Based Payment Award, Shares Issued in Period (in shares)                           69,479