Note 5 - Revenue (Details Textual) - USD ($)	3 Months Ended		9 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024	Dec. 31, 2024	Jan. 12, 2024
Revenues	$ 72,413,000	$ 4,933,000	$ 133,019,000	$ 13,515,000
Income Tax Expense (Benefit)	17,000	18,000	$ 132,000	84,000
Foreign Tax Jurisdiction [Member] | National Tax Agency, Japan [Member]
Royalty Withholding Tax			5.00%
Income Tax Expense (Benefit)	0	2,000	$ 79,000	33,000
Royalty [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Royalty Percentage			4.00%
Non Cash Royalty Revenue [Member]
Revenues	0	40,000	$ 1,579,000	662,000
Non Cash Royalty Revenue [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Revenues	0	40,000	1,600,000	700,000
Government Contract [Member]
Revenues	72,413,000	4,893,000	131,440,000	12,853,000
Unbilled Contracts Receivable	43,200,000		43,200,000		$ 6,200,000
Deferred Revenue, Current	64,828,000		64,828,000		65,400,000
Government Contract [Member] | HHS Barda [Member]
Revenues	72,400,000	4,900,000	131,400,000	12,900,000
Government Contract [Member] | The 2024 ATI-RRPV Contract [Member]
Revenues	71,800,000	4,000,000	130,800,000	4,200,000
Deferred Revenue, Current	64,800,000		64,800,000		64,800,000
Government Assistance, Award Amount, Initial Award	305,000,000		305,000,000
Government Assistance Award, Amount, Initial Award Fixed Fee	67,900,000		67,900,000
Government Assistance, Additional Funding Possible	155,700,000		155,700,000
Government Contract [Member] | The 2024 ATI-RRPV Contract [Member] | Maximum [Member]
Government Assistance, Award Amount	460,700,000		460,700,000
Government Contract [Member] | The 2024 ASPR-BARDA Contract [Member]
Revenues	600,000	$ 900,000	600,000	$ 8,700,000
Deferred Revenue, Current	$ 0		0		$ 600,000
Government Assistance, Award Amount						$ 9,300,000
Government Contract [Member] | Cost-plus-fixed-fee [Member] | The 2024 ATI-RRPV Contract [Member]
Revenues			130,000,000
Government Contract [Member] | Firm Fixed-price Milestone [Member] | The 2024 ATI-RRPV Contract [Member]
Revenues			$ 800,000