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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2014
Number of Suspended Saltwater Injection Wells       2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 11,516 $ 10,702    
Membership Agreement, Term 1 year      
Allowance for Doubtful Accounts Receivable, Ending Balance $ 300   $ 200  
Contract with Customer, Asset, Net, Total 694   580  
Contract with Customer, Liability, Total 3,147   $ 2,718  
Waste Management Services [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 8,458 $ 7,613    
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 73.00% 71.00%    
Waste Management Services [Member] | Maximum [Member]        
Contract Term 1 year      
Golf and Related Operations [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 3,058 $ 3,089    
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 27.00% 29.00%    
Salt Water Injection Operations [Member] | Waste Management Services [Member]        
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 0 $ 0