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Note 6 - Other Long-term Debt - Summary of Other Long-term Debt (Details) - USD ($)	Mar. 31, 2026	Dec. 31, 2025	Jan. 31, 2022
Principal amount	$ 45,155,000	$ 45,155,000
Unamortized debt issuance costs	(676,000)	(705,000)
3.50% Subordinated Notes Due in 2032 [Member]
Principal amount	40,000,000	40,000,000	$ 40,000,000
Unamortized debt issuance costs	(676,000)	(705,000)
Variable Interest Rate Subordinated Debentures Due in 2035 [Member]
Principal amount	5,155,000	5,155,000
Unamortized debt issuance costs	$ 0	$ 0

X

- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Topic 835
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-Section 55
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X

- Definition

The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

+ References

No definition available.

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