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Note 6 - Revenues (Details Textual) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2020 USD ($) | Jun. 30, 2021 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  | 2 |  |  |  |  |  | 2
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 21,301 | $ 16,625 | $ 52,804 | $ 44,095 |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 300 |  | 300 |  | $ 300 |  |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total | 839 | 866 | 839 | $ 866 | 585 | $ 1,102 | $ 1,109 | $ 602 |
Contract with Customer, Liability, Total | 4,400 |  | $ 4,400 |  | 3,200 |  |  |  |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 12.00% |  |  |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 1 | 0 |  |  |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 7.00% |  |  |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 18.00% |  |  |  |  |  |
Waste Management Services [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 11,444 | $ 9,326 | $ 31,279 | $ 29,547 |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 54.00% | 56.00% | 59.00% | 67.00% |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 8,500 |  | $ 8,500 |  | $ 7,900 |  |  |  |
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 |  |  | 1 |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 12.00% |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 0 |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 7.00% |  |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 1 |  | 0 |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  | 21.00% |  |  |  |  |  |
Golf and Related Operations [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 9,857 | $ 7,299 | $ 21,525 | $ 14,548 |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 46.00% | 44.00% | 41.00% | 33.00% |  |  |  |  |
Number of Golf Courses |  |  | 4 |  |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 1,400 |  | $ 1,400 |  | $ 800 |  |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 0 | 0 |  |  |  |  |
Membership Agreement, Term (Year) |  |  | 1 year |  |  |  |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  | 0 |  | 0 |  |  |  |
Salt Water Injection Operations [Member] | Waste Management Services [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | 0 | $ 0 | $ 0 | $ 0 |  |  |  |  |
Customer Advance Deposits [Member] |  |  |  |  |  |  |  |  |
Contract with Customer, Liability, Total | $ 684 | $ 612 | $ 684 | $ 612 | $ 674 | $ 784 | $ 652 | $ 553 |

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