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v3.23.2

Note 5 - Revenues (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Jun. 30, 2023 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2022 USD ($) | Mar. 31, 2023 USD ($) | Mar. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  | 2 |  |  |  |  |  | 2
Accounts Receivable, Allowance for Credit Loss, Ending Balance | $ 300 |  | $ 300 |  | $ 300 |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 1,083 | $ 1,145 | 1,083 | $ 1,145 | 599 | $ 747 | $ 760 | $ 578 |
Contract with Customer, Liability | 5,700 |  | 5,700 |  | 3,600 |  |  |  |
Customer Advance Deposits [Member] |  |  |  |  |  |  |  |  |
Contract with Customer, Liability | $ 1,149 | $ 992 | $ 1,149 | $ 992 | $ 965 | $ 1,082 | $ 920 | $ 795 |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 25.00% | 10.00% |  |  |  |  |
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 |  |  | 14.00% | 6.00% |  |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 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, Percentage | 50.00% | 55.00% | 59.00% | 59.00% |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 8,700 |  | $ 8,700 |  | $ 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 |  |  | 25.00% |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 10.00% |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 14.00% |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 6.00% |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 2 |  | 1 |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 18.00% |  |  |  |  |  |
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, Percentage | 50.00% | 45.00% | 41.00% | 41.00% |  |  |  |  |
Number of Golf Courses |  |  | 4 |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss | $ 2,300 |  | $ 2,300 |  | $ 1,100 |  |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Membership Agreement, Term |  |  | 1 year |  |  |  |  |  |

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