Note 10 - Fair Value Measurement (Tables)

6 Months Ended

Jun. 30, 2022

Notes Tables

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

	Fair Value Measurement at Reporting Date Using
June 30, 2022	Level 1		Level 2		Level 3		Total
Cash equivalents
Money market funds	$	2,444	$	—	$	—	$	2,444
Other current assets
Commodity swap		—		2,524		—		2,524
Total assets	$	2,444	$	2,524	$	—	$	4,968

December 31, 2021
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

June 30, 2021
Cash equivalents
Money market funds	$	23,489	$	—	$	—	$	23,489
Other current assets
Commodity swap		—		1,550		—		1,550
Total assets	$	23,489	$	1,550	$	—	$	25,039
Accrued and other current liabilities
Interest rate swap	$	—	$	5,770	$	—	$	5,770
Total liabilities	$	—	$	5,770	$	—	$	5,770

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

		June 30, 2022				December 31, 2021				June 30, 2021
(in thousands)	Fair Value Hierarchy	Carrying Value		Fair Value		Carrying Value		Fair Value		Carrying Value		Fair Value
Assets:
Held-to-maturity marketable securities (1)	Level 1	$	66,675	$	65,565	$	15,600	$	15,459	$	10,850	$	10,801
Liabilities (including current maturities):
2.75% Convertible Notes (2),(3)	Level 2	$	230,000	$	253,000	$	207,354	$	313,785	$	203,771	$	333,500
Third Amended and Restated Credit Agreement - term loan (2)	Level 3	$	—	$	—	$	123,750	$	124,598	$	127,500	$	128,639
Fourth Amended and Restated Credit Agreement - revolver (2)	Level 3	$	50,000	$	50,056	$	—	$	—	$	—	$	—