Note 6 - Assets Held for Sale - Summary of Assets Held for Sale (Details) - USD ($) $ in Thousands	3 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Disposal Group, Including Discontinued Operation, Assets, Current, Total	$ 352	$ 352
Equipment held-for-sale, cost	696
Equipment held-for-sale, accumulated depreciation	446
Equipment held-for-sale, impairment loss	(250)
Furniture and Office Equipment [Member]
Equipment held-for-sale, cost	17
Equipment held-for-sale, accumulated depreciation	5
Equipment held-for-sale, impairment loss	(12)
Computer Equipment [Member]
Equipment held-for-sale, cost	94
Equipment held-for-sale, accumulated depreciation	6
Equipment held-for-sale, impairment loss	(88)
Laboratory Equipment [Member]
Equipment held-for-sale, cost	585
Equipment held-for-sale, accumulated depreciation	435
Equipment held-for-sale, impairment loss	(150)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member]
Other assets (a)	195	195
Production equipment (b)	157	157
Disposal Group, Including Discontinued Operation, Assets, Current, Total	352	$ 352
Equipment held-for-sale, cost	1,179
Equipment held-for-sale, accumulated depreciation	1,022
Equipment held-for-sale, impairment loss	(157)
Disposal Group, Held-for-sale, Not Discontinued Operations [Member] | Production Equipment [Member]
Equipment held-for-sale, cost	1,179
Equipment held-for-sale, accumulated depreciation	1,022
Equipment held-for-sale, impairment loss	$ (157)