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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 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 $ 13,067 $ 18,425 $ 27,470 $ 33,033          
Membership Agreement, Term (Year)     1 year            
Accounts Receivable, Allowance for Credit Loss, Ending Balance         $ 300 $ 300      
Contract with Customer, Asset, after Allowance for Credit Loss, Total 1,109 1,101 $ 1,109 $ 1,101 602 813 $ 672 $ 554  
Contract with Customer, Liability, Total 4,800   $ 4,800   $ 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 $ 9,088 $ 12,902 $ 20,221 $ 24,336          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 70.00% 70.00% 74.00% 74.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 6,100   $ 6,100   $ 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     0   1        
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]                  
Concentration Risk, Percentage         14.00%        
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 3,979 $ 5,523 $ 7,249 $ 8,697          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 30.00% 30.00% 26.00% 26.00%          
Number of Golf Courses     4            
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,700   $ 1,700   $ 1,000        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
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 $ 652 $ 556 $ 652 $ 556 $ 553 $ 630 $ 536 $ 453