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Note 5 - Revenues (Details Textual)
$ in Thousands
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 30, 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 $ 58,720 $ 68,357      
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300 300      
Contract with Customer, Asset, after Allowance for Credit Loss, Total 585 602   $ 554  
Contract with Customer, Liability, Total $ 3,200 $ 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   13.00%      
Waste Management Services [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 40,371 $ 48,731      
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 69.00% 71.00%      
Accounts Receivable, after Allowance for Credit Loss, Total $ 7,900 $ 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 1 1      
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   14.00%      
Golf and Related Operations [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 18,349 $ 19,626      
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 31.00% 29.00%      
Number of Golf Courses 4        
Accounts Receivable, after Allowance for Credit Loss, Total $ 800 $ 1,000      
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member]          
Number of Major Customers 1 1      
Membership Agreement, Term (Year) 1 year        
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member]          
Number of Major Customers 1 1      
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 $ 674 $ 553 $ 453