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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2023
USD ($)
Dec. 31, 2023
USD ($)
Mar. 31, 2024
USD ($)
Mar. 31, 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 1,110 $ 1,083 1,110 $ 1,083 567 $ 790 $ 747 $ 599  
Contract with Customer, Liability 5,900   5,900   3,400        
Customer Advance Deposits [Member]                  
Contract with Customer, Liability $ 1,312 $ 1,149 $ 1,312 $ 1,149 1,223 $ 1,311 $ 1,082 $ 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       25.00%          
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       14.00%          
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     10.00%            
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 53.00% 49.00% 5900.00% 5800.00%          
Accounts Receivable, after Allowance for Credit Loss $ 9,100   $ 9,100   $ 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     1 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       25.00%          
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       14.00%          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     1   0        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     14.00%            
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 47.00% 51.00% 41.00% 42.00%          
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss $ 2,400   $ 2,400   $ 1,100        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
Membership Agreement, Term     1 year            
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     0   0