Note 13 - Fair Value Measurements - Assets and Liabilities Measured at Fair Value on a Recurring and Nonrecurring Basis (Details) - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Nonrecurring [Member]
Real estate	$ 15,479
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Real estate	0
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Real estate	0
Fair Value, Nonrecurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Real estate	15,479
Fair Value, Recurring [Member]
Marketable equity securities	451,583	$ 597,732
Embedded derivative liability	56,000	56,000
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 1 [Member]
Marketable equity securities	451,583	597,732
Embedded derivative liability	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 2 [Member]
Marketable equity securities	0
Embedded derivative liability	0	0
Fair Value, Recurring [Member] \| Fair Value, Inputs, Level 3 [Member]
Marketable equity securities	0	0
Embedded derivative liability	$ 56,000	$ 56,000

Fair value as of the balance sheet date of the embedded derivative or group of embedded derivatives classified as a liability.

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 4B
-Subparagraph (c)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480434/815-10-50-4B

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- Definition

Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Carrying amount of other real estate not separately disclosed, including, but not limited to, real estate investments, real estate loans that qualify as investments in real estate, and premises that are no longer used in operations may also be included in real estate owned. This does not include real estate assets taken in settlement of troubled loans through surrender or foreclosure.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 942
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.9-03.10(4))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1

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