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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 16,625 $ 18,018 $ 44,095 $ 51,051          
Membership Agreement, Term (Year)     1 year            
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300   $ 300   $ 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 866 853 866 $ 853 602 $ 1,109 $ 1,101 $ 554  
Contract with Customer, Liability, Total 4,000   $ 4,000   $ 3,200        
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage         13.00%        
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 9,326 $ 11,572 $ 29,547 $ 35,908          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 56.00% 64.00% 67.00% 70.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 7,400   $ 7,400   $ 11,000        
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     0            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     1   1        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage     12.00%   14.00%        
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 7,299 $ 6,446 $ 14,548 $ 15,143          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 44.00% 36.00% 33.00% 30.00%          
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,300   $ 1,300   $ 1,000        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0            
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     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 $ 612 $ 507 $ 612 $ 507 $ 553 $ 652 $ 556 $ 453