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Note 14 - Business Segment Information (Details Textual) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 USD ($) | Mar. 31, 2020 | Dec. 31, 2020
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Major Customers |  | 0 |
Waste Management Services [Member] |  |  |
Increase (Decrease) in Total Assets | $ 1.5 |  |
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% |  |
Golf and Related Operations [Member] |  |  |
Number of Major Customers | 1,900,000 |  | 800,000
Increase (Decrease) in Total Assets | $ 1.8 |  |
Golf and Related Operations [Member] | Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |  |
Number of Major Customers | 0 | 0 |
Corporate Segment [Member] |  |  |
Increase (Decrease) in Total Assets | $ 1.0 |  |

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