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Consolidated Statements of Stockholders' Deficit (Unaudited) (Parentheticals) - shares	3 Months Ended
	Mar. 31, 2022	Mar. 31, 2021
Common Stock [Member]
Employee stock purchase plan sales, shares (in shares)	115,000	193,000
Exercise of stock options, shares (in shares)		593,000
Employee stock purchase plan sales, shares (in shares)	115,000	193,000
Exercise of stock options, shares (in shares)	1,108

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Number of shares issued during the period as a result of an employee stock purchase plan.

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