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Note 6 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2020
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 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 $ 16,390 $ 13,067 $ 31,503 $ 27,470          
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300   300   $ 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 1,102 1,109 1,102 $ 1,109 585 $ 701 $ 813 $ 602  
Contract with Customer, Liability, Total 5,400   $ 5,400   3,200        
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]                  
Concentration Risk, Percentage     11.00%            
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     15.00%            
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 8,685 $ 9,088 $ 19,835 $ 20,221          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 53.00% 70.00% 63.00% 74.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 7,100   $ 7,100   $ 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     11.00%            
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     19.00%            
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 7,705 $ 3,979 $ 11,668 $ 7,249          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 47.00% 30.00% 37.00% 26.00%          
Number of Major Customers     1,900,000   800,000        
Number of Golf Courses     4            
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 $ 784 $ 652 $ 784 $ 652 $ 674 $ 752 $ 630 $ 553