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Note 5 - Revenues (Details Textual) $ in Thousands | 3 Months Ended | 6 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($) | Jun. 30, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  |  | 2 |  |  |  |  | 2
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 18,018 | $ 18,148 |  | $ 51,051 | $ 46,369 |  |  |  |
Membership Agreement, Term |  |  |  | 1 year |  |  |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 300 |  |  | $ 300 |  | $ 300 |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total | 853 | 774 | $ 1,101 | 853 | $ 774 | 554 | $ 1,009 | $ 580 |
Contract with Customer, Liability, Total | 3,900 |  |  | $ 3,900 |  | $ 2,900 |  |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  | 0 | 0 |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 15.00% |  |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 23.00% |  |  |
Waste Management Services [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 11,572 | $ 12,557 |  | $ 35,908 | $ 32,525 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 64.00% | 69.00% |  | 70.00% | 70.00% |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 9,700 |  |  | $ 9,700 |  | $ 11,200 |  |  |
Waste Management Services [Member] | Maximum [Member] |  |  |  |  |  |  |  |  |
Contract Term |  |  |  | 1 year |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  | 0 | 0 |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  | 1 |  | 2 |  |  |
Concentration Risk, Percentage |  |  |  | 17.00% |  |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | Two Customers [Member] |  |  |  |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  |  | 25.00% |  |  |
Golf and Related Operations [Member] |  |  |  |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 6,446 | $ 5,591 |  | $ 15,143 | $ 13,844 |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 36.00% | 31.00% |  | 30.00% | 30.00% |  |  |  |
Number of Golf Courses |  |  |  | 4 |  |  |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 1,300 |  |  | $ 1,300 |  | $ 1,000 |  |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |  |  |  |  |
Number of Major Customers |  |  |  | 0 | 0 |  |  |  |
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 |  |  |  |  |
Customer Advance Deposits [Member] |  |  |  |  |  |  |  |  |
Contract with Customer, Liability, Total | $ 507 | $ 423 | $ 556 | $ 507 | $ 423 | $ 453 | $ 491 | $ 430 |

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