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Note 6 - Revenues (Details Textual)
$ in Thousands
3 Months Ended 12 Months Ended
Mar. 31, 2022
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Sep. 03, 2014
Number of Suspended Saltwater Injection Wells 2       2
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 14,309 $ 15,113      
Accounts Receivable, Allowance for Credit Loss, Ending Balance 300        
Contract with Customer, Asset, after Allowance for Credit Loss, Total 760 $ 701 $ 578 $ 585  
Contract with Customer, Liability, Total $ 4,900   $ 3,400    
Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 20.00% 20.00%      
Revenue Benchmark [Member] | Customer Concentration Risk [Member]          
Number of Major Customers 2 1      
Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 13.00% 15.00%      
Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 16.00%        
Accounts Receivable [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage     17.00%    
Customer Advance Deposits [Member]          
Contract with Customer, Liability, Total $ 920 $ 752 $ 795 $ 674  
Waste Management Services [Member]          
Revenue from Contract with Customer, Excluding Assessed Tax, Total $ 9,339 $ 11,150      
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 65.00% 74.00%      
Accounts Receivable, after Allowance for Credit Loss, Total $ 7,900   $ 9,000    
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 2        
Waste Management Services [Member] | Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 20.00%        
Waste Management Services [Member] | Sales Revenue, Net to External Customers [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   20.00%      
Waste Management Services [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 13.00%        
Waste Management Services [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member] | One Customer [Member]          
Concentration Risk, Percentage   15.00%      
Waste Management Services [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member]          
Number of Major Customers 2   1    
Waste Management Services [Member] | Accounts Receivable [Member] | Customer Concentration Risk [Member] | Two Customers [Member]          
Concentration Risk, Percentage 22.00%        
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 $ 4,970 $ 3,963      
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage 35.00% 26.00%      
Number of Golf Courses 4        
Accounts Receivable, after Allowance for Credit Loss, Total $ 2,800   $ 900    
Golf and Related Operations [Member] | Revenue Benchmark [Member] | Customer Concentration Risk [Member]          
Membership Agreement, Term (Year) 1 year