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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2   2           2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 18,425 $ 16,705 $ 33,033 $ 28,221          
Membership Agreement, Term     1 year            
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300   $ 300   $ 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 1,101 1,009 1,101 $ 1,009 554 $ 672 $ 694 $ 580  
Contract with Customer, Liability, Total 4,500   $ 4,500   $ 2,900        
Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Concentration Risk, Percentage     9.00%            
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]                  
Concentration Risk, Percentage         23.00%        
Waste Management Services [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 12,902 $ 11,510 $ 24,336 $ 19,968          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 70.00% 69.00% 74.00% 71.00%          
Accounts Receivable, after Allowance for Credit Loss, Total $ 10,600   $ 10,600   $ 11,200        
Waste Management Services [Member] | Maximum [Member]                  
Contract Term     1 year            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]                  
Number of Major Customers     0 0          
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]                  
Number of Major Customers     1   2        
Concentration Risk, Percentage     10.00%            
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member]                  
Concentration Risk, Percentage         25.00%        
Golf and Related Operations [Member]                  
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 5,523 $ 5,195 $ 8,697 $ 8,253          
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 30.00% 31.00% 26.00% 29.00%          
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          
Customer Advance Deposits [Member]                  
Contract with Customer, Liability, Total $ 556 $ 491 $ 556 $ 491 $ 453 $ 536 $ 518 $ 430