Note 6 - Non-operating Income (Details Textual) - Acquisition of Caris [Member]	Jun. 11, 2021	Dec. 31, 2020
Business Acquisition, Percentage of Voting Interests Acquired	24.90%
Business Combination, Step Acquisition, Equity Interest in Acquiree, Percentage		75.10%

Percentage of voting equity interests acquired at the acquisition date in the business combination.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=79982066&loc=d3e1392-128463

Name:	us-gaap_BusinessAcquisitionPercentageOfVotingInterestsAcquired
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	instant