Note F - Common Stock and Warrants - Reserved Authorized Shares of Common Stock for Future Issuance (Details) - shares	Mar. 31, 2022	Dec. 31, 2021
Common shares reserved for future issuance (in shares)	12,636,639	11,236,414
Warrant [Member]
Common shares reserved for future issuance (in shares)	4,252,600	4,252,600
Share-Based Payment Arrangement [Member]
Common shares reserved for future issuance (in shares)	2,186,769	1,273,879
Possible Future Issuances Under Equity Incentive Plans [Member]
Common shares reserved for future issuance (in shares)	4,697,270	4,209,935
Possible Future Issuances Under Employee Stock Purchase Plans [Member]
Common shares reserved for future issuance (in shares)	1,500,000	1,500,000