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Note 7 - Leases & Property, Plant, Equipment and Water Programs (Details Textual)
3 Months Ended
Feb. 29, 2016
USD ($)
a
Mar. 31, 2023
USD ($)
a
Mar. 31, 2022
USD ($)
Depreciation   $ 329,000 $ 121,000
Property Related to Development of Alfalfa [Member]      
Construction in Progress, Gross   $ 1,429,000  
Area of Land (Acre) | a   160  
Land Improvements, Buildings, Leasehold Improvements, Machinery and Equipment and Furniture and Fixtures [Member]      
Depreciation   $ 329,000 121,000
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 $ 12,000,000.0    
Lessor, Operating Lease, Payment to be Received, Year One     $ 420,000
Minimum [Member]      
Lessee, Operating Lease, Remaining Lease Term (Month)   1 month  
Maximum [Member]      
Lessee, Operating Lease, Remaining Lease Term (Month)   43 years