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Note 11 - Subsequent Events (Details Textual)
 1 Months Ended 9 Months Ended
Nov. 10, 2024
USD ($)
$ / ft
Nov. 05, 2024
USD ($)
$ / shares
shares
Jan. 31, 2023
USD ($)
$ / shares
shares
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Payments to Acquire Property, Plant, and Equipment       $ 522,000 $ 3,815,000
Subsequent Event [Member] | Mojave Groundwater Banking Project Pipe Agreement [Member]          
Payments to Acquire Property, Plant, and Equipment $ 5,000,000        
Arrangement, Payment per Extension $ 1,000,000        
Arrangement, Acquisition Price Per Unit (in USD per Foot) | $ / ft 155        
Direct Offering [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares     10,500,000    
Shares Issued, Price Per Share (in dollars per share) | $ / shares     $ 3.84    
Proceeds from Issuance of Common Stock, Gross     $ 40,320,000    
Proceeds from Issuance of Common Stock, Net     $ 38,500,000    
Direct Offering [Member] | Subsequent Event [Member]          
Stock Issued During Period, Shares, New Issues (in shares) | shares   7,000,000      
Shares Issued, Price Per Share (in dollars per share) | $ / shares   $ 3.34      
Proceeds from Issuance of Common Stock, Gross   $ 23,400,000      
Proceeds from Issuance of Common Stock, Net   $ 21,900,000