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Note 4 - Stock-based Compensation (Tables)

9 Months Ended

Dec. 31, 2020

Notes Tables

Share-based Payment Arrangement, Expensed and Capitalized, Amount [Table Text Block]

		Three Months Ended December 31,								Nine Months Ended December 31,
		2020				2019				2020				2019
Cost of revenues		$	(23	)		$	21			$	35			$	45
Research and development			179				117				470				219
Selling, general and administrative			683				452				2,092				971
Total		$	839			$	590			$	2,597			$	1,236

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

Three Months Ended December 31,

Nine Months Ended December 31,

2020

2019

2020

2019

Expected volatility

N/A

N/A

N/A

66.5

%

Risk-free interest rate

N/A

N/A

N/A

1.8

%

Expected life (years)

N/A

N/A

N/A

5.91

Dividend yield

N/A

N/A

N/A

None

X

- Definition

Tabular disclosure of allocation of amount expensed and capitalized for award under share-based payment arrangement to statement of income or comprehensive income and statement of financial position. Includes, but is not limited to, corresponding line item in financial statement.

+ References

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-SubTopic 10
-Section 50
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- Definition

Tabular disclosure of the significant assumptions used during the year to estimate the fair value of stock options, including, but not limited to: (a) expected term of share options and similar instruments, (b) expected volatility of the entity's shares, (c) expected dividends, (d) risk-free rate(s), and (e) discount for post-vesting restrictions.

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
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