Note 13 - Fair Value Measurements (Tables)

6 Months Ended

Jun. 30, 2019

Notes Tables

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

			Fair Value Measurements at June 30 , 2019 (In thousands)
	Fair Value at June 30 , 2019		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	$	19	$	—	$	—	$	19
2020 Embedded Derivative Liability		—		—		—		—
Total Recurring Fair Value Measurements	$	19	$	—	$	—	$	19
Nonrecurring
Corn and finished goods inventory	$	865	$	17	$	848	$	—
Total Non-Recurring Fair Value Measurements	$	865	$	17	$	848	$	—

			Fair Value Measurements at December 31, 2018 (In thousands)
	Fair Value at December 31, 2018		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	$	22	$	—	$	—	$	22
2020 Embedded Derivative Liability		394		—		—		394
Total Recurring Fair Value Measurements	$	416	$	—	$	—	$	416
Nonrecurring
Corn and finished goods inventory	$	1,047	$	29	$	1,018	$	—
Total Non-Recurring Fair Value Measurements	$	1,047	$	29	$	1,018	$	—

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

	Fair Value Measurements Using Significant Unobservable Inputs (Level 3) (in thousands)
	Derivative Warrant Liability			2020 Notes Embedded Derivative
Opening Balance	$	22		$	394
Gains for the period included in earnings		(3	)		(394	)
Closing balance	$	19		$	—