Note 5 - Revenue (Details Textual) - USD ($)	1 Months Ended	3 Months Ended		6 Months Ended
	Jul. 31, 2023	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023	Jan. 12, 2024	Nov. 30, 2022
Revenues		$ 6,401,000	$ 1,358,000	$ 8,582,000	$ 2,033,000
Income Tax Expense (Benefit)		21,000	19,000	66,000	48,000
Deferred Revenue, Current							$ 2,000,000
The 2024 ATI-RRPV Contract [Member]
Government Assistance Award, Amount, Initial Award Fixed Fee		64,700,000		64,700,000
The 2024 ATI-RRPV Contract [Member] | Maximum [Member]
Government Assistance, Award Amount		452,900,000		452,900,000
Government Assistance, Award Amount, Initial Award		65,700,000		65,700,000
Government Assistance, Additional Funding Possible		387,200,000		$ 387,200,000
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	1,000	$ 31,000	15,000
Royalty [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Royalty Percentage				4.00%
Non Cash Royalty Revenue [Member]
Revenues		37,000	30,000	$ 622,000	308,000
Non Cash Royalty Revenue [Member] | Daiichi Sankyo Collaberation and License Agreement [Member]
Revenues		37,000	30,000	600,000	300,000
Government Contract [Member]
Revenues		6,364,000	0	7,960,000	0
Government Contract Receivable, Unbilled Amounts		3,700,000		3,700,000
Government Contract [Member] | The 2024 ATI-RRPV Contract [Member]
Revenues		200,000		200,000
Government Contract [Member] | The 2024 ASPR-BARDA Contract [Member]
Revenues		6,200,000		7,800,000
Grant [Member]
Revenues		$ 0	$ 1,328,000	$ 0	$ 1,725,000
Grants Receivable							$ 3,500,000
Grant Milestone Completion [Member]
Revenues	$ 1,500,000