Note 6 - Deposit-type Contracts (Details Textual)	Mar. 31, 2026
Minimum [Member]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	2.00%
Maximum [Member]
Policyholder Account Balance, Guaranteed Minimum Credit Rating	6.00%

Guaranteed minimum crediting rate on policyholder account balance.

Reference 1: http://www.xbrl.org/2003/role/exampleRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 55
-Paragraph 29F
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480046/944-40-55-29F

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 944
-SubTopic 40
-Name Accounting Standards Codification
-Section 50
-Paragraph 7A
-Subparagraph (d)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147480081/944-40-50-7A

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