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Note 5 - Revenues (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Jun. 30, 2025 USD ($) | Jun. 30, 2024 USD ($) | Dec. 31, 2024 USD ($) | Mar. 31, 2025 USD ($) | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  | 2 |  |  |  |  |  | 2
Revenue from Contract with Customer, Excluding Assessed Tax | $ 20,252 | $ 23,057 | $ 36,320 | $ 41,915 |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss | 300 |  | 300 |  | $ 300 |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 1,037 | $ 1,110 | 1,037 | $ 1,110 | 582 | $ 733 | $ 790 | $ 567 |
Contract with Customer, Liability | $ 5,700 |  | $ 5,700 |  | $ 3,500 |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers | 0 | 0 | 0 | 0 |  |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 12.00% |  |  |  |
Waste Management Services [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | $ 9,742 | $ 12,220 | $ 19,419 | $ 24,690 |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | 7,500 |  | $ 7,500 |  | $ 7,500 |  |  |  |
Waste Management Services [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Contract Term (Year) |  |  | 1 year |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 48.00% | 53.00% |  |  |  |  |
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 |  |  |  |  | 14.00% |  |  |  |
Golf and Related Operations [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax | 10,510 | $ 10,837 | $ 16,901 | $ 17,225 |  |  |  |  |
Number of Golf Courses |  |  | 4 |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage |  |  | 47.00% | 41.00% |  |  |  |  |
Membership Agreement, Term |  |  | 1 year |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 2,400 |  | $ 2,400 |  | $ 1,100 |  |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage | 52.00% | 47.00% |  |  |  |  |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 0 |  |  |  |  |  |
Salt Water Injection Wells [Member] | Waste Management Services [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax |  |  | $ 0 | $ 0 |  |  |  |  |
Customer Advance Deposits [Member] |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | $ 1,649 | $ 1,312 | $ 1,649 | $ 1,312 | $ 1,565 | $ 1,647 | $ 1,311 | $ 1,223 |

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