Note 4 - Prepaid Expenses and Other Current Assets (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Table Text Block]

(in thousands)	December 31,		December 31,
	2019		2018
Prepaid sales rebates	$	401	$	925
Rent receivable		—		108
Prepaid rent		—		130
Prepaid employees’ benefits		8		113
Prepaid dues and subscription		82		130
Prepaid insurance		94		57
Prepaid patents		85		79
Prepaid security deposit for lease		65		—
Retainer		46		—
Other		105		218
Total prepaid expenses and other current assets	$	886	$	1,760