Note 3 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2022

Notes Tables

Schedule of Inventory, Current [Table Text Block]

Description	March 31, 2022		December 31, 2021
		(in thousands)
Raw Materials	$	164	$	132
Work-in-Progress		1		338
Finished Goods		3,674		1,988
Total Inventory	$	3,839	$	2,458

Incremental Weighted Average Shares Attributable to Dilutive Effect [Table Text Block]

	March 31, 2022		March 31, 2021
Stock Options		4,189,006		3,033,047
Warrants		6,596,096		7,935,503
Convertible Preferred Stock		6,476,275		9,517,191
Total Potential Dilutive Shares		17,261,377		20,485,741