Note 17 - Related Party Transactions - Related Party Revenue, Cost of Goods Sold, and Expenses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Total related party revenue	$ 524	$ 250	$ 77
Cost of goods sold	384	176	426
Total related party expenses	218	409	359
Director Bob Wu [Member]
Total related party expenses	17	83
China Kington [Member]
Total related party expenses	201	326	359
China Kington [Member] | The OP Warrants [Member]
Total related party expenses			359
China Kington [Member] | The June 2019 Warrants [Member]
Total related party expenses		144
China Kington [Member] | The August 2019 Warrants [Member]
Total related party expenses		162
China Kington [Member] | Broker Fee for the Exercise of the June 2019 Warrants [Member]
Total related party expenses	41
China Kington [Member] | The 2019 Foreign Warrants [Member]
Total related party expenses	160
China Kington [Member] | Promissory Note [Member]
Total related party expenses		20
NeutroPhase [Member]
Total related party revenue	524	209	47
Cost of goods sold	384	176	426
Licensing [Member]
Total related party revenue		41	34
Cost of goods sold