Note 13 - Fair Value Measurements (Tables)

3 Months Ended

Mar. 31, 2021

Notes Tables

Fair Value Measurements, Recurring and Nonrecurring [Table Text Block]

			Fair Value Measurements at March 31, 2021 (In thousands)
	Fair Value at March 31, 2021		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	84	$	—	$	—	$	84
Nonrecurring
Palladium and finished goods inventory	$	880	$	264	$	616	$	—

			Fair Value Measurements at December 31, 2020 (In thousands)
	Fair Value at December 31, 2020		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)
Recurring:
Derivative Warrant Liability	$	31	$	—	$	—	$	31
Nonrecurring
Corn, palladium and finished goods inventory	$	866	$	235	$	631	$	—

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

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
	Derivative Warrant Liability
Balance, December 31, 2020	$	31
Total loss included in earnings		53
Balance, March 31 , 2021	$	84