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

3 Months Ended

Mar. 31, 2020

Notes Tables

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

(in thousands)	March 31,		December 31,
	2020		2019
Prepaid sales rebates	$	290	$	401
Prepaid dues and subscription		49		82
Prepaid insurance		64		94
Prepaid patents		68		85
Prepaid security deposit for lease		65		65
Retainer		32		46
Other		94		113
Total prepaid expenses and other current assets	$	662	$	886