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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Dec. 31, 2023
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Accounts Receivable, Allowance for Credit Loss $ 300   $ 300     $ 300      
Contract with Customer, Asset, after Allowance for Credit Loss 845 $ 813 845 $ 813 $ 1,110 567 $ 1,083 $ 599  
Contract with Customer, Liability 4,700   4,700     3,400      
Customer Advance Deposits [Member]                  
Contract with Customer, Liability $ 1,305 $ 1,050 $ 1,305 $ 1,050 $ 1,311 1,223 $ 1,149 $ 965  
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     10.00%            
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]                  
Concentration Risk, Percentage       15.00%          
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     1 2          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage     6.00%            
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]                  
Concentration Risk, Percentage       7.00%          
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     14.00%            
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 47.00% 49.00% 5500.00%            
Accounts Receivable, after Allowance for Credit Loss $ 8,400   $ 8,400            
Waste Management Services [Member] | Maximum [Member]                  
Contract Term (Year)     1 year            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member]                  
Number of Major Customers       2          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     10.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]                  
Concentration Risk, Percentage       15.00%          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage     6.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]                  
Concentration Risk, Percentage       7.00%          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     1            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     18.00%            
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 53.00% 51.00% 45.00%            
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss $ 1,600   $ 1,600     $ 1,100      
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0            
Membership Agreement, Term     1 year            
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     0