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Note 6 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 21,301 $ 16,625 $ 52,804 $ 44,095          
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300   300   $ 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 839 866 839 $ 866 585 $ 1,102 $ 1,109 $ 602  
Contract with Customer, Liability, Total 4,400   $ 4,400   3,200        
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     12.00%            
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     1 0          
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]                  
Concentration Risk, Percentage     7.00%            
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     18.00%            
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 11,444 $ 9,326 $ 31,279 $ 29,547          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 54.00% 56.00% 59.00% 67.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 8,500   $ 8,500   $ 7,900        
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            
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] | Revenue Benchmark [Member]                  
Number of Major Customers     0            
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] | 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     21.00%            
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 9,857 $ 7,299 $ 21,525 $ 14,548          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 46.00% 44.00% 41.00% 33.00%          
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,400   $ 1,400   $ 800        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
Membership Agreement, Term (Year)     1 year            
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     0   0        
Salt Water Injection Operations [Member] | Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total 0 $ 0 $ 0 $ 0          
Customer Advance Deposits [Member]                  
Contract with Customer, Liability, Total $ 684 $ 612 $ 684 $ 612 $ 674 $ 784 $ 652 $ 553