Note 12 - Fair Value Measurement (Details Textual) $ in Millions	Sep. 30, 2020 USD ($)
Notes Payable, Fair Value Disclosure	$ 468.3
Fair Value, Inputs, Level 1 [Member]
Notes Payable, Fair Value Disclosure	$ 514.6

Fair value portion of notes payable.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19,20,22)
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant