Note 6 - Revenue From Contracts With Customers - Disaggregation of Revenue (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Revenues	$ 8,072,120	$ 2,706,981
Non-Refundable Payments - Milestones [Member]
Revenues	1,345,320	45,058
Non-Refundable Payments - Up-front Payments [Member]
Revenues	6,726,600	1,168,712
Research and Development Services [Member]
Revenues	200	1,493,211
GSK Inhaled [Member]
Revenues	8,071,920	438,351
GSK Inhaled [Member] | Non-Refundable Payments - Milestones [Member]
Revenues	1,345,320	45,058
GSK Inhaled [Member] | Non-Refundable Payments - Up-front Payments [Member]
Revenues	6,726,600	225,293
GSK Inhaled [Member] | Research and Development Services [Member]
Revenues		168,000
Other Customer [Member]
Revenues	200	2,268,630
Other Customer [Member] | Non-Refundable Payments - Milestones [Member]
Revenues
Other Customer [Member] | Non-Refundable Payments - Up-front Payments [Member]
Revenues		943,419
Other Customer [Member] | Research and Development Services [Member]
Revenues	$ 200	$ 1,325,211