Note 6 - Accrued Expenses and Other Current Liabilities (Tables)

6 Months Ended

Jun. 30, 2021

Notes Tables

Schedule of Accrued Liabilities and Other Current Liabilities [Table Text Block]

	June 30,		December 31,
	2021		2020
Accrued expenses	$	35	$	87
Accrued salaries and employee benefits		682		961
Accrued clinical trial costs		430		452
Grant liability		599		615
Customer deposits		96		90
Total	$	1,842	$	2,205