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Note 5 - Revenues (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2025
USD ($)
Dec. 31, 2024
USD ($)
Dec. 31, 2023
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2     2
Revenue from Contract with Customer, Excluding Assessed Tax $ 83,545 $ 83,795    
Accounts Receivable, Allowance for Credit Loss 200 300    
Contract with Customer, Asset, after Allowance for Credit Loss 541 582 $ 567  
Contract with Customer, Liability $ 3,500 $ 3,500    
Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Number of Major Customers 0 0    
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]        
Concentration Risk, Percentage 24.00% 12.00%    
Waste Management Services [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 46,010 $ 45,922    
Accounts Receivable, after Allowance for Credit Loss $ 8,800 $ 7,500 8,400  
Waste Management Services [Member] | Maximum [Member]        
Contract Term (Year) 1 year      
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Concentration Risk, Percentage 55.00% 55.00%    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Number of Major Customers 2 1    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]        
Concentration Risk, Percentage 26.00% 14.00%    
Golf and Related Operations [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 37,535 $ 37,873    
Number of Golf Courses 4      
Membership Agreement, Term 1 year      
Accounts Receivable, after Allowance for Credit Loss $ 1,000 $ 1,100 1,100  
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]        
Concentration Risk, Percentage 45.00% 45.00%    
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]        
Number of Major Customers 0      
Salt Water Injection Wells [Member] | Waste Management Services [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax $ 0 $ 0    
Customer Advance Deposits [Member]        
Contract with Customer, Liability $ 1,688 $ 1,565 $ 1,223