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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 |  |  |

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