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Note 3 - Discontinued Operations - Schedule of Disposal Groups (Details) - USD ($) $ in Thousands	6 Months Ended		9 Months Ended		12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Loss on assets held for sale	$ 31,848	$ 0	$ 92,706	$ 0	$ 93,118	$ 0	$ 0
Loss from discontinued operations, net of tax					(80,221)	(140,531)	(6,596)
B Medical Systems Business [Member] \| Discontinued Operations, Held-for-Sale [Member]
Disposal group, revenue					67,968	83,125	113,123
Disposal group, cost of revenue					49,979	77,231	92,609
Gross profit					17,989	5,894	20,514
Research and development					5,785	4,704	4,046
Selling, general and administrative					25,739	34,949	47,361
Impairment of goodwill and intangible assets					0	111,317	0
Contingent consideration - fair value adjustments					0	0	(18,549)
Loss on assets held for sale					93,118	0	0
Restructuring charges					1,235	5,042	0
Total operating expenses					125,877	156,012	32,858
Operating loss					(107,888)	(150,118)	(12,344)
Interest income (expense), net					40	286	194
Other income (expense), net					(212)	911	1,258
Loss before income taxes					(108,060)	(148,921)	(10,892)
Income tax benefit					(28,518)	(8,390)	(5,670)
Loss from discontinued operations, net of tax					(79,542)	(140,531)	(5,222)
B Medical Systems Business [Member] \| Discontinued Operations, Held-for-Sale [Member] \| Product [Member]
Disposal group, revenue					58,569	69,690	101,091
Disposal group, cost of revenue					41,073	64,871	85,315
B Medical Systems Business [Member] \| Discontinued Operations, Held-for-Sale [Member] \| Service [Member]
Disposal group, revenue					9,399	13,435	12,032
Disposal group, cost of revenue					$ 8,906	$ 12,360	$ 7,294