Note I - Stockholders' Equity (Details Textual) - shares	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Common Stock, Shares Authorized (in shares)	100,000,000	100,000,000	85,000,000
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	2,440,673	2,066,343	2,428,329
Chief Executive Officer, Chief Financial Officer and Employees [Member]
Deferred Compensation Arrangement with Individual, Shares Authorized for Issuance (in shares)	2,057,976	1,891,979
Non-Employees [Member]
Common Stock, Capital Shares Reserved for Future Issuance (in shares)	382,697	174,364