Note 8 - Common Stock (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Common Stock Reserved for Future Issuance [Table Text Block]

	As of December 31,
	2019		2018
Conversion of Series A Preferred Stock		476,279		552,819
Stock-based compensation awards		185,729		129,099
Employee Stock Purchase Plan		2,953		2,953
Total		664,961		684,871