Note 8 - Debt - Long-term Debt (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Sep. 30, 2021
Funded debt	$ 199,000	$ 175,000
Issuance cost	(85)	(170)
Total long-term debt	198,915	174,830
Line of Credit [Member]
Funded debt	$ 199,000	$ 175,000

Amount, excluding unamortized premium (discount) and debt issuance cost, of long-term debt. Excludes lease obligation.

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Name:	us-gaap_LongTermDebt
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant