Note 1 - Summary of Significant Accounting Policies - Weighted Average Common Shares Outstanding (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Net (loss) income	$ (8,050)	$ (12,453)	$ 32,533
Net income (loss) from continuing operations	$ 6,310	$ (8,514)	$ 33,723
Weighted average common shares (in shares)	13,989,489	14,582,450	14,975,972
Dilutive potential common shares (in shares)	0	0	36,555
Weighted average dilutive common shares outstanding (in shares)	13,989,489	14,582,450	15,012,527
Continuing operations (in dollars per share)	$ 0.45	$ (0.58)	$ 2.25
Discontinued operations (in dollars per share)	(1.03)	(0.27)	(0.08)
Basic (loss) earnings per share (in dollars per share)	(0.58)	(0.85)	2.17
Continuing operations (in dollars per share)	0.45	(0.58)	2.25
Discontinued operations (in dollars per share)	(1.03)	(0.27)	(0.08)
Diluted (loss) earnings per share (in dollars per share)	$ (0.58)	$ (0.85)	$ 2.17