Note 3 - Procurement Contract and Research Agreements (Details Textual) $ in Millions | Apr. 03, 2020USD ($) | Jul. 30, 2018USD ($) | Aug. 31, 2018USD ($) | Mar. 31, 2019USD ($) | Dec. 31, 2018USD ($) | Dec. 31, 2020USD ($) | Dec. 31, 2019USD ($) | Dec. 31, 2018USD ($) | Jan. 13, 2021USD ($) | Jun. 30, 2020USD ($) | May 31, 2020USD ($) | Jul. 31, 2019USD ($) | Sep. 10, 2018 | Dec. 31, 2017USD ($) | May 13, 2011 |
Contract with Customer, Liability, Revenue Recognized | | | | | | $ 0.1 | | | | | | | | | |
The 19C BARDA Contract [Member] | | | | | | | | | | | | | | | |
Number of Courses to Be Delivered | | | | | | | | | | | | | 1,488,000 | | |
Number of Courses Stored As Vendor Managed Inventory | | | | | | | | | | | | | 212,000 | | |
Government Contract, Value of Award | | | | | | 602.5 | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities | | | | | | $ 51.7 | | | | | | | | | |
Base Period of Performance (Year) | | | | | | 5 years | | | | | | | | | |
Government Contract, Value, Payments Remaining Related to Exercised Options | | | | | | $ 127.1 | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options | | | | | | $ 423.7 | | | | | | | | | |
Base Period of Performance, Exercise of Options, Term (Year) | | | | | | 10 years | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities, Delivery of Courses | | | | | | $ 11.1 | | | | | | | | | |
Government Contract, Base Period, Number of Deliveries | | | | | | 35,700 | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities, Manufacture of Courses | | | | | | $ 8 | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities, Advanced Development | | | | | | 32 | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities, Supportive Procurement Activities | | | | | | 0.6 | | | | | | | | | |
Proceeds from Delivery of Courses | | | | | | $ 11.1 | | | | | | | | | |
Number of Courses Delivered | | | | | | 35,700 | | | | | | | | | |
Proceeds from Other Base Period Activities | | | | | | $ 9.7 | | | | | | | | | |
Government Contract, Value of Unexercised Options, Supportive Procurement Activities | | | | | | 5.6 | | | | | | | | | |
The 19C BARDA Contract [Member] | Transferred over Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | 7.5 | $ 7.4 | | | | | | | | |
The 19C BARDA Contract [Member] | Transferred at Point in Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | $ 112.6 | 11.1 | | | | | | | | |
The 19C BARDA Contract [Member] | IV TPOXX [Member] | | | | | | | | | | | | | | | |
Government Contract, Base Period, Number of Courses Manufactured | | | | | | 20,000 | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options, Delivery of Courses | | | | | | $ 337.7 | | | | | | | | | |
Government Contract, Value, Payments Related to Exercised Options, Funding of Post-Marketing Activities | | | | | | $ 3.6 | | | | | | | | | |
Government Contract, Unexercised Options, Number of Deliveries | | | | | | 1,089,000 | | | | | | | | | |
Number of Manufacturing Steps | | | | | | 2 | | | | | | | | | |
The 19C BARDA Contract [Member] | IV BDS [Member] | | | | | | | | | | | | | | | |
Government Contract, Base Period, Value of Award for Delivery and Support Activities, Manufacture of Courses | | | | | | $ 3.2 | | | | | | | | | |
Proceeds from the Manufacture of Courses | | | | | | 3.2 | | | | | | | | | |
Contract with Customer, Liability, Total | | | | | | 3.2 | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options, Manufacture of Courses | | | | | | $ 30.7 | | | | | | | | | |
Government Contract, Number of Options for Manufacture of Product | | | | | | 3 | | | | | | | | | |
Government Contract, Courses Manufactured Upon Exercise of Options | | | | | | 64,000 | | | | | | | | | |
The 19C BARDA Contract [Member] | Oral TPOXX [Member] | | | | | | | | | | | | | | | |
Number of Courses to Be Delivered | | | | | | 363,070 | | | | | | | | | |
Proceeds from Delivery of Courses | | | | | | $ 101.3 | | | | | | | | | |
Number of Courses Delivered | | | | | | 363,000 | | | | | | | | | |
Government Contract, Value, Payments Related to Exercised Options, Procurement of Raw Materials | | | | | | $ 11.2 | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options, Delivery of Courses | | | | | | 101.3 | | | | | | | | | |
Government Contract, Value, Payments Related to Exercised Options, Funding of Post-Marketing Activities | | | | | | 14.6 | | | | | | | | | |
Proceeds for the Procurement of Raw Materials | | | | | | 11.2 | | | | | | | | | |
Proceeds for the Funding of Post-marketing Activities | | | | | | 5.4 | | | | | | | | | |
The 19C BARDA Contract [Member] | IV FDP [Member] | | | | | | | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options, Delivery of Courses | | | | | | $ 76.8 | | | | | | | | | |
Government Contract, Value, Unexercised Options, Manufacture of Courses | | | | | | 192,000 | | | | | | | | | |
Government Contract, Value, Payments Currently Specified as Unexercised Options, Manufacture of Courses | | | | | | $ 76.8 | | | | | | | | | |
Government Contract, Number of Options for Manufacture of Product | | | | | | 3 | | | | | | | | | |
Government Contract, Courses Manufactured Upon Exercise of Options | | | | | | 64,000 | | | | | | | | | |
The 2011 BARDA Contract [Member] | | | | | | | | | | | | | | | |
Number of Courses to Be Delivered | | | | | | | | | | | | | | | 1,700,000 |
Government Contract, Value of Award | | | | | | $ 508.4 | | | | | | | | | |
Base Period of Performance (Year) | | 84 months | | | | | | | | | | | | | |
Government Contract, Value, Payments Remaining Related to Exercised Options | | $ 72.7 | | | | | | | | | | | | | |
Number of Additional Courses to be Delivered at No Additional Cost | | | | | | | | | | | | | | | 300,000 |
Proceeds from the Manufacture and Delivery of Courses | | | | | | $ 459.8 | | | | | | | | | |
Number of Courses to be Manufactured | | | | | | 1,700,000 | | | | | | | | | |
Proceeds from Reimbursements in Connection with Development and Supportive Activities | | | | | | $ 45.6 | | | | | | | | | |
Amount Eligible to be Received for Reimbursements of Development and Supportive Activities | | | | | | 3 | | | | | | | | | |
Proceeds from Government Contract Options, Exercised | | | $ 50 | | | | | | | | | | | | |
Government Contract, Increase (Decrease) in Value of Award, FDA Approval | | 50 | | | | | | | | | | | | | |
Government Contract, Value, Payments Related to Exercised Options, Development and Supportive Activities | | 58.3 | | | | | | | | | | | | | |
Government Contract, Value, Payments Related to Exercised Options, Production-related Activities | | $ 14.4 | | | | | | | | | | | | | |
Cash Consideration Received | | | | | | | | $ 375.6 | | | | | | | |
Revenue, Government Contract | | | | | $ 90.9 | | | | | | | | | | |
Reduced Holdback Amount | | | | | $ 40.9 | | | | | | | | | | |
Contract Value Option FDA Approval | | | | | | 50 | | | | | | | | | |
Deferred Costs, Noncurrent, Total | | | | | | | | | | | | | | $ 96.5 | |
The 2011 BARDA Contract [Member] | Transferred over Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | 0.2 | 0.3 | | | | | | | | |
The 2011 BARDA Contract [Member] | Transferred at Point in Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | 0.4 | 0.1 | | | | | | | | |
Meridian Contract [Member] | Oral TPOXX [Member] | Subsequent Event [Member] | | | | | | | | | | | | | | | |
Government Contract Receivable | | | | | | | | | $ 33 | | | | | | |
Government Contract Receivable, Remainder of Fiscal Year | | | | | | | | | 3.4 | | | | | | |
Government Contract Receivable, Year One | | | | | | | | | $ 17 | | | | | | |
Canadian Contract [Member] | Meridian Medical Technologies [Member] | | | | | | | | | | | | | | | |
Government Contract Receivable | $ 14 | | | | | | | | | $ 2.3 | | | | | |
Government Contract, Term (Year) | 4 years | | | | | | | | | | | | | | |
Canadian Contract [Member] | Transferred at Point in Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | 2.3 | | | | | | | | | |
The IV Formulation R & D Contract with BARDA [Member] | | | | | | | | | | | | | | | |
Government Contract, Future Aggregate Research and Development Funding | | | | | | 2.1 | | | | | | | | | |
The IV Formulation R & D Contract with BARDA [Member] | Transferred over Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | 1.4 | 7.5 | | | | | | | | |
Contract with Customer, Asset, Cumulative Catch-up Adjustment to Revenue, Change in Estimate of Transaction Price | | | | $ 3.3 | | | 3.3 | | | | | | | | |
The PEP Label Expansion R & D Contract with the Department of Defense [Member] | | | | | | | | | | | | | | | |
Grants Receivable | | | | | | | | | | | $ 26 | $ 19.5 | | | |
Government Contract, Initial Award | | | | | | 22.4 | | | | | $ 23 | $ 12.4 | | | |
The PEP Label Expansion R & D Contract with the Department of Defense [Member] | Transferred over Time [Member] | | | | | | | | | | | | | | | |
Contract with Customer, Liability, Revenue Recognized | | | | | | $ 0.3 | $ 0.3 | | | | | | | | |