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Note 7 - Leases & Property, Plant, Equipment and Water Programs (Details Textual)
9 Months Ended
Feb. 29, 2016
USD ($)
a
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Feb. 01, 2024
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Operating Lease, Right-of-Use Asset   $ 2,186,000     $ 431,000  
Depreciation   907,000 $ 942,000      
Land Improvements, Buildings, Leasehold Improvements, Machinery and Equipment and Furniture and Fixtures [Member]            
Depreciation   $ 907,000 $ 942,000      
Minimum [Member]            
Lessee, Operating Lease, Remaining Lease Term (Month)   1 month        
Maximum [Member]            
Lessee, Operating Lease, Remaining Lease Term (Month)   26 years        
Northern Pipeline Agreement [Member]            
Lessor, Operating Lease, Term of Contract (Year)       26 years    
Operating Lease, Right-of-Use Asset       $ 1,900,000    
Lessee, Operating Lease, Liability, to be Paid       4,800,000    
Lessee, Operating Lease, Liability, Undiscounted Excess Amount       $ 2,900,000    
Operating Lease, Weighted Average Discount Rate, Percent       10.00%    
Operating Lease, Annual Rent Payments       $ 186,000    
Fenner Valley Farms LLC Lease Agreement [Member]            
Lessor, Operating Lease, Term of Contract (Year) 99 years          
Area of Real Estate Property (Acre) | a 2,100          
Long-term Debt, Total $ 12,000,000          
Lessor, Operating Lease, Payment to be Received, Year One           $ 420,000