Note L - Fair Value of Financial Instruments - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Total liabilities	$ 23,362	$ 10,202
Total assets	24,688	16,900
US Government Agencies Debt Securities [Member]
Total assets		7,189
US Treasury Securities [Member]
Total assets	24,688	9,711
Fair Value, Inputs, Level 1 [Member]
Total liabilities	0	0
Total assets	24,688	9,711
Fair Value, Inputs, Level 1 [Member] | US Government Agencies Debt Securities [Member]
Total assets		0
Fair Value, Inputs, Level 1 [Member] | US Treasury Securities [Member]
Total assets	24,688	9,711
Fair Value, Inputs, Level 2 [Member]
Total liabilities	0	0
Total assets	0	7,189
Fair Value, Inputs, Level 2 [Member] | US Government Agencies Debt Securities [Member]
Total assets		7,189
Fair Value, Inputs, Level 2 [Member] | US Treasury Securities [Member]
Total assets	0	0
Fair Value, Inputs, Level 3 [Member]
Total liabilities	23,362	10,202
Total assets	0	0
Fair Value, Inputs, Level 3 [Member] | US Government Agencies Debt Securities [Member]
Total assets		0
Fair Value, Inputs, Level 3 [Member] | US Treasury Securities [Member]
Total assets	0	0
CVR Liability [Member]
Total liabilities	7,262
CVR Liability [Member] | Fair Value, Inputs, Level 1 [Member]
Total liabilities	0
CVR Liability [Member] | Fair Value, Inputs, Level 2 [Member]
Total liabilities	0
CVR Liability [Member] | Fair Value, Inputs, Level 3 [Member]
Total liabilities	7,262
Warrants [Member]
Total liabilities	16,100	10,202
Warrants [Member] | Fair Value, Inputs, Level 1 [Member]
Total liabilities	0	0
Warrants [Member] | Fair Value, Inputs, Level 2 [Member]
Total liabilities	0	0
Warrants [Member] | Fair Value, Inputs, Level 3 [Member]
Total liabilities	$ 16,100	$ 10,202