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Investments - Narrative (Details) - USD ($)
1 Months Ended 3 Months Ended
Apr. 26, 2023
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]        
SERP investments at fair value   $ 1,993,000   $ 1,889,000
CoBank        
Schedule of Equity Method Investments [Line Items]        
SERP investments at fair value   10,100,000   $ 10,000,000
Other nonoperating income (expense)   $ 100,000 $ 100,000  
Percentage of patronage credit paid in cash   88.00%    
Percentage of patronage credit paid in share   12.00%    
Valley Network Partnership        
Schedule of Equity Method Investments [Line Items]        
Ownership interest, percentage   20.00%   20.00%
Valley Network Partnership | Subsequent Event        
Schedule of Equity Method Investments [Line Items]        
Distribution of capital $ 100,000      
Equity Method Investee        
Schedule of Equity Method Investments [Line Items]        
Revenue from related parties     200,000  
Related party costs     $ 28,200