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Note 7 - Stockholders' Equity and Stock-based Compensation Expense - Stock Option and Performance Award Activity (Details) - shares	3 Months Ended	9 Months Ended
	Sep. 30, 2023	Sep. 30, 2023
Outstanding, options (in shares)		2,529,448
Options granted (in shares)		132,000
Options exercised (in shares)	(214,124)	(495,299)
Options forfeited/canceled (in shares)		(7,142)
Outstanding, options (in shares)	2,159,007	2,159,007
Performance Shares [Member]
Outstanding, performance awards (in shares)		7,142
Performance awards granted (in shares)		0
Performance awards exercised (in shares)		0
Performance awards forfeited/canceled (in shares)		0
Outstanding, performance awards (in shares)	7,142	7,142

X

- Definition

Number of non-option equity instruments exercised by participants.

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Number of shares under non-option equity instrument agreements that were cancelled as a result of occurrence of a terminating event.

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