Note 19 - Related Party Transactions - Related Party Revenue, Cost of Goods Sold, and Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Total related party revenue	$ 368	$ 524	$ 250
Cost of goods sold	325	384	176
Total related party expenses	0	251	409
Director Bob Wu [Member]
Total related party expenses	0	50	83
China Kington [Member]
Total related party expenses	0	201	326
China Kington [Member] | The OP Warrants [Member]
Total related party expenses	0	0	0
China Kington [Member] | The June 2019 Warrants [Member]
Total related party expenses	0	0	144
China Kington [Member] | The August 2019 Warrants [Member]
Total related party expenses	0	0	162
China Kington [Member] | Broker Fee for the Exercise of the June 2019 Warrants [Member]
Total related party expenses	0	41	0
China Kington [Member] | The 2019 Foreign Warrants [Member]
Total related party expenses	0	160	0
China Kington [Member] | Promissory Note [Member]
Total related party expenses	0	0	20
NeutroPhase [Member]
Total related party revenue	368	524	209
Cost of goods sold	325	384	176
Licensing [Member]
Total related party revenue	0	0	41
Cost of goods sold	$ 0	$ 0	$ 0