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Note 2 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

Notes Tables

Share-based Payment Arrangement, Activity [Table Text Block]

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2019			968				21,050			$	5.96
Plan amendment			8,000				-				-
Restricted stock unit awards granted			(22	)			-				-
Restricted stock unit awards cancelled			-				-				-
Stock option awards granted			(547	)			547				4.87
Stock option awards exercised			-				(193	)			2.76
Stock option awards cancelled			2,495				(2,495	)			6.66
Balance June 30, 2020			10,894				18,909			$	5.85

										Weighted
										Average
		Awards				Options				Exercise
		Available				Outstanding				Price
Balance December 31, 2019			171				1,329			$	3.60
Plan amendment			1,700				-				-
Stock option awards granted			(1,502	)			1,502				3.34
Stock option awards exercised			-				-				-
Stock option awards cancelled			145				(145	)			4.28
Balance June 30, 2020			514				2,686			$	3.42

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

		2020				2019
Expected Life in Years			5.5				5.5
Expected Volatility			83.7	%			81.0	%
Expected Dividend Yield			0.0	%			0.0	%
Risk-Free Interest Rate			0.5	%			2.3	%

X

- Definition

Tabular disclosure of activity for award under share-based payment arrangement. Includes, but is not limited to, outstanding award at beginning and end of year, granted, exercised, forfeited, and weighted-average grant date fair value.

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