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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Accounts Receivable, Allowance for Credit Loss, Ending Balance $ 300   $ 300   $ 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 878 $ 839 878 $ 839 578 $ 1,145 $ 1,102 $ 585  
Contract with Customer, Liability, Total 4,600   4,600   3,400        
Customer Advance Deposits [Member]                  
Contract with Customer, Liability, Total $ 1,004 $ 684 $ 1,004 $ 684 $ 795 $ 992 $ 784 $ 674  
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     2 1          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]                  
Concentration Risk, Percentage     6.00% 7.00%          
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]                  
Concentration Risk, Percentage     10.00% 12.00%          
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]                  
Concentration Risk, Percentage     34.00%            
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage         17.00%        
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 58.00% 54.00%              
Accounts Receivable, after Allowance for Credit Loss, Total $ 11,900   $ 11,900   $ 9,000        
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     59.00% 59.00%          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]                  
Concentration Risk, Percentage     6.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage       7.00%          
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] | Two Customers [Member]                  
Concentration Risk, Percentage     10.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage       12.00%          
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] | Two Customers [Member]                  
Concentration Risk, Percentage     38.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage         19.00%        
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 42.00% 46.00%              
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,500 $ 900 $ 1,500 $ 900          
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Membership Agreement, Term     1 year