Note 6 - Operating Lease (Details) - USD ($) $ in Thousands	1 Months Ended	4 Months Ended	8 Months Ended	12 Months Ended
	Apr. 15, 2019	Apr. 30, 2019	Dec. 31, 2019	Dec. 31, 2019	Dec. 31, 2018	May 02, 2019
Notes To Financial Statements Abstract
Lease expiration date				Oct. 31, 2019
Lease Term	7 years
Renewal lease term	5 years
Monthly base rent	$ 35
Escalation percent	3.00%
Estimated borrowing rate			5.25%	5.25%	7.50%
Rent expense		$ 183	$ 312		$ 573
Operating lease liability			2,496	$ 2,496		$ 2,698
ROU asset			2,509	2,509	$ 187	$ 2,742
Indirect cost			$ 44	$ 44