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Note 5 - Revenues (Details Textual) $ in Thousands | 6 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Sep. 30, 2018 | Dec. 31, 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 | $ 62,234 | $ 55,848 |  | $ 62,234 | $ 55,848 |
Membership Agreement, Term |  |  |  | 1 year |  |
Contract with Customer, Asset, Net, Total | 554 | 580 |  | $ 554 | 580 |
Contract with Customer, Liability, Total | 2,900 | 2,700 |  | $ 2,900 | $ 2,700 |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |
Number of Major Customers |  |  | 0 | 1 |  |
Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 9.00% |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |
Number of Major Customers |  |  |  | 0 | 0 |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  |  | 14.00% |
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 | 44,535 | 38,398 |  | $ 44,535 | $ 38,398 |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage |  |  |  | 72.00% | 69.00% |
Accounts Receivable, Net, Total | 11,200 | 8,900 |  | $ 11,200 | $ 8,900 |
Waste Management Services [Member] | Maximum [Member] |  |  |  |  |  |
Contract Term |  |  |  | 1 year |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] |  |  |  |  |  |
Number of Major Customers |  |  |  |  | 1 |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Sales Revenue, Net [Member] | One Customer [Member] |  |  |  |  |  |
Concentration Risk, Percentage |  |  |  | 12.00% | 12.00% |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |  |
Number of Major Customers |  |  |  | 2 |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |  |
Number of Major Customers |  |  |  |  | 1 |
Concentration Risk, Percentage |  |  |  |  | 16.00% |
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 | 17,699 | 17,450 |  | $ 17,699 | $ 17,450 |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage |  |  |  | 28.00% | 31.00% |
Number of Golf Courses |  |  | 3 | 3 |  |
Accounts Receivable, Net, Total | 1,000 | 1,000 |  | $ 1,000 | $ 1,000 |
Salt Water Injection Operations [Member] | Waste Management Services [Member] |  |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total |  |  |  | 0 | 0 |
Customer Advance Deposits [Member] |  |  |  |  |  |
Contract with Customer, Liability, Total | $ 453 | $ 430 |  | $ 453 | $ 430 |

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