Note L - Convertible Senior Notes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Convertible Debt [Table Text Block]

	December 31,
	2019
Principal	$	80,500
Unamortized debt issuance costs		(3,459	)
Net carrying amount	$	77,041

Interest Income and Interest Expense Disclosure [Table Text Block]

	Three months ended December 31,						Year ended December 31,
	2019			2018			2019			2018
Contractual interest expense		984			—			3,276			—
Amortization of debt issuance costs		207			—			681			—
Total interest cost	$	1,191		$	—		$	3,957		$	—
Effective interest rate		5.1	%		0	%		5.1	%		0	%