Note 8 - Stock Transactions and Stock-based Compensation - Stock Option and Non-vested Stock Award Activity (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended	6 Months Ended	12 Months Ended
Jun. 30, 2024	Jun. 30, 2024	Mar. 31, 2024
Options outstanding (in shares)		194
Options outstanding, weighted average exercise price (in dollars per share)	$ 181.89
Outstanding, Weighted- Average Remaining Contractual Life (Year)	3 years 1 month 6 days		3 years 2 months 12 days
Outstanding, Aggregate Intrinsic Value	$ 0	$ 0	$ 26
Options granted (in shares)		0
Awards granted, weighted average exercise price (in dollars per share)	$ 0
Options forfeited or expired (in shares)		(13)
Awards forfeited or expired, weighted average exercise price (in dollars per share)	147.07
Awards exercised (in shares)		0
Awards exercised, weighted average exercise price (in dollars per share)	$ 0
Options outstanding (in shares)	181	181
Options outstanding, weighted average exercise price (in dollars per share)	$ 184.42	$ 184.42	$ 181.89

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.

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 718
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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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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 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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