Note 2 - Summary of Significant Accounting Policies - Revision of Previously Issued Financial Statements Policy (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		9 Months Ended		12 Months Ended
	Dec. 31, 2023	Mar. 31, 2024	Mar. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2022
Accrued compensation and tax withholdings		$ (7,831)	$ (23,649)		$ (17,682)	$ (4,184)	$ (19,055)	$ 11,404
Other current assets and liabilities	$ 3,910	1,379		$ 383	(33,944)	(2,487)	(33,655)	913
Net cash provided by operating activities	13,756	22,371	(41,022)	32,151	(21,640)	50,289	7,158	(466,046)
Proceeds from issuance of common stock		1,678	1,852		1,852	3,279	3,621	5,245
Net cash used in financing activities		(185,542)	(503,284)		(675,369)	(659,207)	(840,459)	(62,762)
Effects of exchange rate changes on cash and cash equivalents	24,548	16,255		15,596	62,976	21,124	44,666	(180,819)
Purchases of property, plant and equipment included in accounts payable and accrued expenses	2,164	2,270	3,040	2,575	2,898	$ 2,767	2,725	$ 10,196
Previously Reported [Member]
Accrued compensation and tax withholdings		(6,153)	(21,797)		(15,830)		(15,434)
Other current assets and liabilities	15,957	12,913		7,484	(36,578)		(26,944)
Net cash provided by operating activities	26,431	34,787	(39,170)	36,578	(22,422)		17,490
Proceeds from issuance of common stock		0	0		0		0
Net cash used in financing activities		(187,220)	(505,136)		(677,221)		(844,080)
Effects of exchange rate changes on cash and cash equivalents	12,501	4,721		8,495	65,610		37,955
Purchases of property, plant and equipment included in accounts payable and accrued expenses	0	0	0	2,203	0		0
Revision of Prior Period, Error Correction, Adjustment [Member]
Accrued compensation and tax withholdings		(1,678)	(1,852)		(1,852)		(3,621)
Other current assets and liabilities	(12,047)	(11,534)		(7,101)	2,634		(6,711)
Net cash provided by operating activities	(12,675)	(12,416)	(1,852)	(4,427)	782		(10,332)
Proceeds from issuance of common stock		1,678	1,852		1,852		3,621
Net cash used in financing activities		1,678	1,852		1,852		3,621
Effects of exchange rate changes on cash and cash equivalents	12,047	11,534		7,101	(2,634)		6,711
Purchases of property, plant and equipment included in accounts payable and accrued expenses	$ 2,164	$ 2,270	$ 3,040	$ 372	$ 2,898		$ 2,725