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Note 8 - Stockholders' Equity - Stock Option and Non-vested Stock Award Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	12 Months Ended
	Jun. 30, 2022	Mar. 31, 2022
Options outstanding (in shares)	202
Options outstanding, weighted average exercise price (in dollars per share)	$ 167.14
Outstanding, Weighted- Average Remaining Contractual Life (Year)	3 years 2 months 12 days	2 years 10 months 24 days
Outstanding, Aggregate Intrinsic Value	$ 18,261
Options granted (in shares)	42
Awards granted, weighted average exercise price (in dollars per share)	$ 185,570
Options forfeited or expired (in shares)	(6)
Awards forfeited or expired, weighted average exercise price (in dollars per share)	$ 227,420
Awards exercised (in shares)	(42)
Awards exercised (in dollars per share)	$ 101,340
Options outstanding (in shares)	196	202
Outstanding as of September 30, 2022 (in dollars per share)	$ 183.13	$ 167.14
Outstanding, Aggregate Intrinsic Value	$ 1,978	$ 18,261

X

- Definition

For presentations that combine terminations, the number of shares under options that were cancelled during the reporting period as a result of occurrence of a terminating event specified in contractual agreements pertaining to the stock option plan or that expired.

+ References

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-Publisher FASB
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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.

+ References

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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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Number of options outstanding, including both vested and non-vested options.

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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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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 option awards outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Number of share options (or share units) exercised during the current period.

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