Note 10 - Earnings Per Share - Computation of Basic and Diluted Earnings per Share (Details) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended			6 Months Ended
	Mar. 31, 2024 USD ($) item $ / shares shares	Sep. 30, 2023 $ / shares	Mar. 31, 2023 USD ($) $ / shares shares	Jun. 20, 2023 USD ($) $ / shares
EARNINGS PER SHARE
Net income | $	$ 2,032		$ 25,257	$ 25,257
Forfeitable Dividends Declared on Unvested Stock Based Awards | $	$ 33
Weighted average shares used to compute basic EPS (in shares)			44,281
Weighted average shares used to compute diluted EPS (in shares)			44,692
Basic (in dollars per share) | $ / shares	$ 0.00		$ 0.57	$ 0.57
Diluted (in dollars per share) | $ / shares	$ 0.00		$ 0.57	$ 0.57
Share in dividends for unvested restricted stock awards with common shares | item	1
Employee Stock Option [Member]
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)			411
Restricted Stock
EARNINGS PER SHARE
Antidilutive shares	718
Restricted Stock Units
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)			684
Weighted average shares used to compute diluted EPS (in shares)			396
Performance Stock Units
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)			767
Antidilutive shares	1,057
Class A Common Stock
EARNINGS PER SHARE
Net income | $	$ (106)
Weighted average shares used to compute basic EPS (in shares)	42,496
Weighted average shares used to compute diluted EPS (in shares)	42,496
Basic (in dollars per share) | $ / shares	$ 0.00
Diluted (in dollars per share) | $ / shares	$ 0.00
Antidilutive shares	749
Class B Common Stock
EARNINGS PER SHARE
Net income | $	$ 2,032
Weighted average shares used to compute basic EPS (in shares)	8,508
Weighted average shares used to compute diluted EPS (in shares)	8,798
Basic (in dollars per share) | $ / shares	$ 0.24
Diluted (in dollars per share) | $ / shares	$ 0.23	$ 0.23
Class B Common Stock | Employee Stock Option [Member]
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)	96
Class B Common Stock | Restricted Stock Units
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)	32
Class B Common Stock | Performance Stock Units
EARNINGS PER SHARE
Dilutive effect of stock-based awards (in shares)	162
Class A Restricted Stock
EARNINGS PER SHARE
Net income | $	$ 1
Class B Restricted Stock
EARNINGS PER SHARE
Net income | $	$ 72