Note M - Fair Value of Financial Instruments (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis [Table Text Block]

			Quoted Prices		Significant
			in Active		Other		Significant
	Balance at		Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2019		(Level 1)		(Level 2)		(Level 3)
Deerfield Warrant liability	$	77	$	-	$	-	$	77
Embedded Warrant Put Option		19		-		-		19
Fundamental change and make-whole interest provisions embedded within 2021 Notes		-		-		-		-
Deerfield Note Conversion Feature		-		-		-		-
KVK Warrant liability		24		-		24		-
Total liabilities	$	120	$	-	$	24	$	96

			Quoted Prices		Significant
			in Active		Other		Significant
	Balance at		Markets for		Observable		Unobservable
	December 31,		Identical Assets		Inputs		Inputs
	2018		(Level 1)		(Level 2)		(Level 3)
Deerfield Warrant liability	$	1,557	$	-	$	-	$	1,557
Embedded Warrant Put Option		154		-		-		154
Fundamental change and make-whole interest provisions embedded within 2021 Notes		-		-		-		-
Deerfield Note Conversion Feature		134		-		-		134
KVK Warrant liability		273		-		273		-
Total liabilities	$	2,118	$	-	$	273	$	1,845
Trading securities:
Certificates of deposit		246		246		-		-
U.S. Treasury securities		3,014		3,014		-		-
Total assets	$	3,260	$	3,260	$	-	$	-

Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block]

	2019			2018
Balance as of beginning of period	$	1,845		$	7,709
Gain on extinguishment of debt		-			(2	)
Adjustment to fair value		(1,749	)		(5,862	)
Balance as of end of period	$	96		$	1,845