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Note H - Fair Value of Financial Instruments (Details Textual)
6 Months Ended
Jun. 30, 2022
USD ($)
Dec. 31, 2021
USD ($)
Deerfield Warrant Liability [Member]    
Liabilities, Fair Value Disclosure, Total $ 52,000 $ 288,000
Liabilities, Fair Value Disclosure, Increase from Ten Percent Increase in Enterprise Value 12,000  
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Liquidity Event 30,000,000.0  
Liabilities, Fair Value Disclosure, Estimated Amount of Weighted-average Probability of Fundamental Change $ 380,000,000  
Deerfield Warrant Liability [Member] | Weighted Average Probability of Liquidity Event [Member]    
Derivative Liability, Measurement Input 0.25  
Deerfield Warrant Liability [Member] | Weighted Average Probability of Fundamental Change [Member]    
Derivative Liability, Measurement Input 0.28  
Embedded Put Option [Member]    
Liabilities, Fair Value Disclosure, Total $ 4,000 $ 18,000
Liabilities, Fair Value Disclosure, Increase from Ten Percent Increase in Enterprise Value $ 1,000