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Note 5 - Revenues (Details Textual) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  |  | 2
Revenue from Contract with Customer, Excluding Assessed Tax | $ 80,515 | $ 81,180 |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 300 | 300 |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 567 | 599 | $ 578 |
Contract with Customer, Liability | $ 3,400 | $ 3,600 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member] |  |  |  |
Concentration Risk, Percentage | 12.00% | 22.00% |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Number of Major Customers | 2 | 1 |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member] |  |  |  |
Concentration Risk, Percentage | 6.00% | 14.00% |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 16.00% |  |
Waste Management Services [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 44,611 | $ 49,763 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 55.00% | 61.00% |  |
Accounts Receivable, after Allowance for Credit Loss | $ 8,400 | $ 10,000 |  |
Waste Management Services [Member] | Maximum [Member] |  |  |  |
Contract Term (Year) | 1 year |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] |  |  |  |
Number of Major Customers | 2 | 1 |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member] |  |  |  |
Concentration Risk, Percentage | 12.00% |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 22.00% |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member] |  |  |  |
Concentration Risk, Percentage | 6.00% |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 14.00% |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |
Number of Major Customers |  | 1 |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |
Concentration Risk, Percentage |  | 18.00% |  |
Golf and Related Operations [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 35,984 | $ 31,497 |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 45.00% | 39.00% |  |
Number of Golf Courses | 4 |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 1,100 | $ 1,100 |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |
Membership Agreement, Term | 1 year |  |  |
Salt Water Injection Wells [Member] |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 0 | 0 |  |
Customer Advance Deposits [Member] |  |  |  |
Contract with Customer, Liability | $ 1,223 | $ 965 | $ 795 |

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