Note 10 - Segment Information (Details Textual) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Disposal Group, Including Discontinued Operation, Assets, Total	$ 4.7	$ 5.2

Amount classified as assets attributable to disposal group held for sale or disposed of.

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