Note 5 - Revenue (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		9 Months Ended
	Jul. 31, 2023	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Jan. 12, 2024	Dec. 31, 2023	Nov. 30, 2022
Revenues		$ 4,933,000	$ 2,101,000	$ 13,515,000	$ 4,134,000
Income Tax Expense (Benefit)		18,000	39,000	84,000	87,000
The 2024 ATI-RRPV Contract [Member]
Government Assistance Award, Amount, Initial Award Fixed Fee		67,900,000		67,900,000
Government Assistance, Additional Funding Possible		359,600,000		359,600,000
The 2024 ATI-RRPV Contract [Member] | Maximum [Member]
Government Assistance, Award Amount		456,100,000		456,100,000
Government Assistance, Award Amount, Initial Award		96,500,000		$ 96,500,000
The 2024 ASPR-BARDA Contract [Member]
Government Assistance, Award Amount						$ 9,300,000
Foreign Tax Jurisdiction [Member] | National Tax Agency, Japan [Member]
Royalty Withholding Tax				5.00%
Income Tax Expense (Benefit)		2,000	23,000	$ 33,000	38,000
Royalty [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Royalty Percentage				4.00%
Non Cash Royalty Revenue [Member]
Revenues		40,000	446,000	$ 662,000	754,000
Non Cash Royalty Revenue [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Revenues		40,000	400,000	700,000	800,000
Government Contract [Member]
Revenues		4,893,000	0	12,853,000	0
Government Contract Receivable, Unbilled Amounts		3,100,000		3,100,000
Deferred Revenue, Current		65,447,000		65,447,000			$ 0
Government Contract [Member] | The 2024 ATI-RRPV Contract [Member]
Revenues		4,000,000		4,200,000
Deferred Revenue, Current		64,800,000		64,800,000			0
Government Contract [Member] | The 2024 ASPR-BARDA Contract [Member]
Revenues		900,000		8,700,000
Deferred Revenue, Current		600,000		600,000			$ 0
Grant [Member]
Revenues		$ 0	$ 1,655,000	$ 0	$ 3,380,000
Deferred Revenue, Current								$ 2,000,000
Grants Receivable								$ 3,500,000
Grant Milestone Completion [Member]
Revenues	$ 1,500,000