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Note 5 - Revenues (Details Textual)
$ in Thousands
6 Months Ended 9 Months Ended 12 Months Ended
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Sep. 30, 2018
Dec. 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 $ 62,234 $ 55,848   $ 62,234 $ 55,848  
Membership Agreement, Term       1 year    
Contract with Customer, Asset, Net, Total 554 580   $ 554 580  
Contract with Customer, Liability, Total 2,900 2,700   $ 2,900 $ 2,700  
Customer Concentration Risk [Member] | Sales Revenue, Net [Member]            
Number of Major Customers     0 1    
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]            
Concentration Risk, Percentage         9.00%  
Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Number of Major Customers       0 0  
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Percentage         14.00%  
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 44,535 38,398   $ 44,535 $ 38,398  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage       72.00% 69.00%  
Accounts Receivable, Net, Total 11,200 8,900   $ 11,200 $ 8,900  
Waste Management Services [Member] | Maximum [Member]            
Contract Term       1 year    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member]            
Number of Major Customers         1  
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member]            
Concentration Risk, Percentage       12.00% 12.00%  
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]            
Number of Major Customers       2    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]            
Number of Major Customers         1  
Concentration Risk, Percentage         16.00%  
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 17,699 17,450   $ 17,699 $ 17,450  
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage       28.00% 31.00%  
Number of Golf Courses     3 3    
Accounts Receivable, Net, Total 1,000 1,000   $ 1,000 $ 1,000  
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 $ 453 $ 430   $ 453 $ 430