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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

X

- Definition

The increase (decrease) during the reporting period in total assets.

+ References

No definition available.

+ Details

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- Definition

Represents the number of major customers accounting for 10% or more of the specified concentration risk benchmark, which includes, but not limited to, sales revenue, accounts receivable, etc.

+ References

No definition available.

+ Details

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X

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 280
-SubTopic 10
-Section 50
-Paragraph 42
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Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
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