Note 8 - Accrued Expenses and Other Current Liabilities (Tables)

12 Months Ended

Dec. 31, 2020

Notes Tables

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

	December 31,
	2020		2019
Accrued expenses	$	87	$	10
Accrued salaries and employee benefits		961		652
Accrued director compensation		—		648
Accrued clinical trial costs		452		519
Grant liability		615		630
Customer deposits		90		102
Total	$	2,205	$	2,561