Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	9 Months Ended
Jun. 30, 2026	Sep. 30, 2025
Net operating loss carryforward	$ 377
Operating loss carryforwards, expiration	will carry forward indefinitely
Federal tax credit carryforward	$ 30,200	$ 22,300
Tax credit carryforward, expiration	Federal tax credits carry forward for 20 years.
Income Tax Jurisdiction, Domestic Federal [Member]
Operating loss carryforwards	$ 320
Income Tax Jurisdiction, Domestic State and Local [Member]
Operating loss carryforwards	$ 9,800

Amount before allocation of valuation allowances of deferred tax asset attributable to deductible operating loss carryforwards.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 6
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-6

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Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards.

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Amount of operating loss carryforward, before tax effects, available to reduce future taxable income under enacted tax laws.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 740
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482685/740-10-50-3

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A description of the limitations on the use of all operating loss carryforwards available to reduce future taxable income.

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Description of the limitation related to use of the tax credit carryforward.

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