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Note 14 - Business Segment Information (Details Textual) $ in Millions | 9 Months Ended
--- | ---
Sep. 30, 2021 USD ($) | Sep. 30, 2020
Waste Management Services [Member] |  |
Increase (Decrease) in Total Assets | $ 0.7 |
Golf and Related Operations [Member] |  |
Increase (Decrease) in Total Assets | 1.6 |
Corporate Segment [Member] |  |
Increase (Decrease) in Total Assets | $ (2.6) |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] |  |
Number of Major Customers | 1 | 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Waste Management Services [Member] |  |
Number of Major Customers | 0 |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Golf and Related Operations [Member] |  |
Number of Major Customers | 0 | 0
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] |  |
Concentration Risk, Percentage | 7.00% |
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] | Waste Management Services [Member] |  |
Concentration Risk, Percentage | 7.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Waste Management Services [Member] |  |
Number of Major Customers | 1 |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] |  |
Concentration Risk, Percentage | 12.00% |
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] | Waste Management Services [Member] |  |
Concentration Risk, Percentage | 12.00% |

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