Note 8 - Fair Value Measurement (Tables)

12 Months Ended

Dec. 31, 2021

Notes Tables

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

	Fair Value Measurement at Reporting Date Using
December 31, 2021	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	65,233	$	—	$	—	$	65,233
Total assets	$	65,233	$	—	$	—	$	65,233
Accrued and other current liabilities
Interest rate swap	$	—	$	3,514	$	—	$	3,514
Total liabilities	$	—	$	3,514	$	—	$	3,514
December 31, 2020
Cash equivalents
Money market funds	$	70,483	$	—	$	—	$	70,483
Total assets	$	70,483	$	—	$	—	$	70,483
Accrued and other current liabilities
Interest rate swap	$	—	$	7,606	$	—	$	7,606
Total liabilities	$	—	$	7,606	$	—	$	7,606

Fair Value, by Balance Sheet Grouping [Table Text Block]

December 31,		2021				2020
	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities (1)	Level 1	$	15,600	$	15,459	$	5,200	$	5,200
Liabilities (including current maturities):
2.75% Convertible Notes (2),(3)	Level 2	$	207,354	$	313,785	$	200,303	$	248,400
Credit Agreement - term loan (2)	Level 3	$	123,750	$	124,598	$	131,250	$	133,030