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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 19,522 $ 16,390 $ 33,831 $ 31,503          
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300   300            
Contract with Customer, Asset, after Allowance for Credit Loss, Total 1,145 1,102 1,145 $ 1,102 $ 578 $ 760 $ 701 $ 585  
Contract with Customer, Liability, Total 5,800   $ 5,800   $ 3,400        
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     1 1          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage     6.00% 7.00%          
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     10.00% 11.00%          
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     19.00%   17.00%        
Customer Advance Deposits [Member]                  
Contract with Customer, Liability, Total 992 784 $ 992 $ 784 $ 795 $ 920 $ 752 $ 674  
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 10,717 $ 8,685 $ 20,056 $ 19,835          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 55.00% 53.00% 59.00% 63.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 8,100   $ 8,100   $ 9,000        
Waste Management Services [Member] | Maximum [Member]                  
Contract Term (Year)     1 year            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     1            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage     6.00% 7.00%          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member]                  
Number of Major Customers       1          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     10.00% 11.00%          
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     24.00%   19.00%        
Waste Management Services [Member] | Salt Water Injection Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total     $ 0 $ 0          
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 8,805 $ 7,705 $ 13,775 $ 11,668          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 45.00% 47.00% 41.00% 37.00%          
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss, Total $ 2,400   $ 2,400   $ 900        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Membership Agreement, Term (Year)     1 year