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Note 6 - Revenues (Details Textual)
$ in Thousands
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells   2     2
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 70,383 $ 58,720    
Accounts Receivable, Allowance for Credit Loss, Ending Balance   300 300    
Contract with Customer, Asset, after Allowance for Credit Loss, Total   578 585 $ 602  
Contract with Customer, Liability, Total   $ 3,400 $ 3,200    
Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   13.00%      
Revenue Benchmark [Member] | Customer Concentration Risk [Member]          
Number of Major Customers   1 0    
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   8.00%      
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   17.00%      
Customer Advance Deposits [Member]          
Contract with Customer, Liability, Total   $ 795 $ 674 $ 553  
Waste Management Services [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 42,710 $ 40,371    
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage   61.00% 69.00%    
Accounts Receivable, after Allowance for Credit Loss, Total   $ 9,000 $ 7,900    
Waste Management Services [Member] | Maximum [Member]          
Contract Term (Year)   1 year      
Waste Management Services [Member] | Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member]          
Number of Major Customers 1        
Waste Management Services [Member] | Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   13.00%      
Waste Management Services [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   8.00%      
Waste Management Services [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Number of Major Customers   1      
Waste Management Services [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   19.00%      
Waste Management Services [Member] | Salt Water Injection Operations [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 0 0    
Golf and Related Operations [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total   $ 27,673 $ 18,349    
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage   39.00% 31.00%    
Number of Golf Courses   4      
Accounts Receivable, after Allowance for Credit Loss, Total   $ 1,000 $ 800    
Golf and Related Operations [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]          
Membership Agreement, Term (Year)   1 year