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Note 15 - Stockholders' Equity - Options Activities (Details) - USD ($) $ / shares in Units, $ in Thousands	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Outstanding, options (in shares)	140,281
Outstanding, weighted-average exercise price (in dollars per share)	$ 49.95
Granted (in shares)	0	5,939
Granted, weighted-average exercise price (in dollars per share)
Exercised (in shares)	(2,588)
Exercised, weighted-average exercise price (in dollars per share)	$ 24.30
Canceled/forfeited, options (in shares)	(10,528)
Canceled/forfeited, weighted-average exercise price (in dollars per share)	$ 129.53
Outstanding, options (in shares)	127,165	140,281
Outstanding, weighted-average exercise price (in dollars per share)	$ 44.37	$ 49.95
Outstanding, weighted-average remaining contractual term (Year)	2 years
Outstanding, aggregate intrinsic value	$ 167
Exercisable, options (in shares)	127,140
Exercisable, weighted-average exercise price (in dollars per share)	$ 44.38
Exercisable, weighted-average remaining contractual term (Year)	2 years
Fully vested and expected to vest, options (in shares)	124,196
Fully vested and expected to vest, weighted-average exercise price (in dollars per share)	$ 45.18
Fully vested and expected to vest, weighted-average remaining contractual term (Year)	1 year 328 days
Fully vested and expected to vest, aggregate intrinsic value	$ 143

X

- Definition

The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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Weighted average price of options that were either forfeited or expired.

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Gross number of share options (or share units) granted during the period.

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Weighted average price at which grantees can acquire the shares reserved for issuance under the stock option plan.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Number of fully vested and expected to vest options outstanding that can be converted into shares under option plan. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Weighted average price at which option holders acquired shares when converting their stock options into shares.

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Weighted average per share amount at which grantees can acquire shares of common stock by exercise of options.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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