Note 13 - Business Segment Information (Details Textual) $ in Millions	6 Months Ended
	Jun. 30, 2024 USD ($)	Jun. 30, 2023
Waste Management Services [Member] | Operating Segments [Member]
Increase (Decrease) in Total Assets	$ 3.8
Customer Concentration Risk [Member] | Revenue Benchmark [Member]
Number of Major Customers	1	2
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member]
Concentration Risk, Percentage	6.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | One Customer [Member] | Waste Management Services [Member]
Concentration Risk, Percentage	6.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member]
Concentration Risk, Percentage		14.00%
Customer Concentration Risk [Member] | Revenue Benchmark [Member] | Two Customers [Member] | Waste Management Services [Member]
Concentration Risk, Percentage		14.00%
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Waste Management Services [Member]
Number of Major Customers	1	2
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | One Customer [Member] | Waste Management Services [Member]
Concentration Risk, Percentage	10.00%
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member]
Concentration Risk, Percentage		25.00%
Customer Concentration Risk [Member] | Sales Revenue, Net to External Customers [Member] | Two Customers [Member] | Waste Management Services [Member]
Concentration Risk, Percentage		25.00%