XML 19 R35.htm IDEA: XBRL DOCUMENT v3.19.3
Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jun. 30, 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 $ 18,018 $ 18,148   $ 51,051 $ 46,369        
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 853 774 $ 1,101 853 $ 774 554 $ 1,009 $ 580  
Contract with Customer, Liability, Total 3,900     $ 3,900   $ 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       15.00%          
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 $ 11,572 $ 12,557   $ 35,908 $ 32,525        
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 64.00% 69.00%   70.00% 70.00%        
Accounts Receivable, after Allowance for Credit Loss, Total $ 9,700     $ 9,700   $ 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       17.00%          
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 $ 6,446 $ 5,591   $ 15,143 $ 13,844        
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 36.00% 31.00%   30.00% 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 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          
Customer Advance Deposits [Member]                  
Contract with Customer, Liability, Total $ 507 $ 423 $ 556 $ 507 $ 423 $ 453 $ 491 $ 430