Note 3 - Discontinued Operations - Schedule of Disposal Groups (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Impairment of Long-Lived Assets to be Disposed of	$ 24,000		$ 24,187	$ 0
Loss from discontinued operations, net of tax	(22,271)	$ (120,678)	(26,190)	(129,210)
B Medical Systems Business [Member] | Discontinued Operations, Held-for-Sale [Member]
Disposal group, revenue	17,206	22,779	34,797	35,371
Disposal group, cost of revenue	11,533	20,057	26,261	32,881
Gross profit	5,673	2,722	8,536	2,490
Research and development	1,201	973	2,836	2,153
Selling, general and administrative	7,729	9,256	13,916	17,943
Impairment of goodwill and intangible assets	0	111,317	0	111,317
Impairment of Long-Lived Assets to be Disposed of	24,187	0	24,187	0
Restructuring charges	364	3,917	678	4,251
Total operating expenses	33,481	125,463	41,617	135,664
Operating loss	(27,808)	(122,741)	(33,081)	(133,174)
Interest income (expense), net	(15)	85	(10)	212
Other income (expense), net	(604)	518	(74)	682
Loss before income taxes	(28,427)	(122,138)	(33,165)	(132,280)
Income tax benefit	(6,536)	(1,460)	(7,355)	(3,070)
Loss from discontinued operations, net of tax	(21,891)	(120,678)	(25,810)	(129,210)
B Medical Systems Business [Member] | Discontinued Operations, Held-for-Sale [Member] | Product [Member]
Disposal group, revenue	15,886	20,245	30,174	29,931
Disposal group, cost of revenue	10,118	17,642	21,540	27,698
B Medical Systems Business [Member] | Discontinued Operations, Held-for-Sale [Member] | Service [Member]
Disposal group, revenue	1,320	2,534	4,623	5,440
Disposal group, cost of revenue	$ 1,415	$ 2,415	$ 4,721	$ 5,183