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Note 5 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Jan. 07, 2020
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2         2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 14,403 $ 14,608        
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 813 672   602 $ 554  
Contract with Customer, Liability, Total $ 4,000     $ 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 8.00%     13.00%    
Waste Management Services [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 11,133 $ 11,434        
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 77.00% 78.00%        
Accounts Receivable, after Allowance for Credit Loss, Total $ 9,100     $ 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 1     1    
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member]            
Concentration Risk, Percentage 10.00%     14.00%    
Golf and Related Operations [Member]            
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 3,270 $ 3,174        
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 23.00% 22.00%        
Number of Golf Courses 4          
Accounts Receivable, after Allowance for Credit Loss, Total $ 1,900     $ 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          
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 $ 630 $ 536   $ 553 $ 453