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Note 2 - Summary of Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block]

		March 31,
Excluded potentially dilutive securities (1):		2021				2020
Options to purchase common stock			1,040,522				1,709,106
Unvested restricted stock units			4,771,537				2,397,299
Financing warrants to purchase common stock			6,372				805,747
Total potential dilutive securities			5,818,431				4,912,152

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

		Revenue
		Three Months Ended March 31,
		2021				2020
Clarios (successor of Johnson Controls Battery Group, Inc.)			—	%			100	%

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