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Note 6 - Revenues (Details Textual) $ in Thousands | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 USD ($) | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Sep. 03, 2014
Number of Suspended Saltwater Injection Wells | 2 |  |  |  | 2
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 15,113 | $ 14,403 |  |  |
Accounts Receivable, Allowance for Credit Loss, Ending Balance | 300 |  | $ 300 |  |
Contract with Customer, Asset, after Allowance for Credit Loss, Total | 701 | $ 813 | 585 | $ 602 |
Contract with Customer, Liability, Total | $ 4,100 |  | 3,200 |  |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |
Number of Major Customers |  | 0 |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] |  |  |  |  |
Number of Major Customers | 1 |  |  |  |
Customer Concentration Risk [Member] | Accounts Receivable [Member] | One Customer [Member] |  |  |  |  |
Concentration Risk, Percentage | 20.00% |  |  |  |
Waste Management Services [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 11,150 | $ 11,133 |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 74.00% | 77.00% |  |  |
Accounts Receivable, after Allowance for Credit Loss, Total | $ 8,800 |  | $ 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 | 20.00% |  |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |  |  |
Number of Major Customers | 1 | 0 |  |  |
Waste Management Services [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |  |  |  |
Concentration Risk, Percentage | 15.00% |  |  |  |
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 | 25.00% |  |  |  |
Golf and Related Operations [Member] |  |  |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Total | $ 3,963 | $ 3,270 |  |  |
Revenue from Contract with Customer, Excluding Assessed Tax, Percentage | 26.00% | 23.00% |  |  |
Number of Major Customers | 1,900,000 |  | 800,000 |  |
Number of Golf Courses | 4 |  |  |  |
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 |  |  |
Customer Advance Deposits [Member] |  |  |  |  |
Contract with Customer, Liability, Total | $ 752 | $ 630 | $ 674 | $ 553 |

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