Note 4 - Fair Value (Tables)

9 Months Ended

Sep. 30, 2019

Notes Tables

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

Liabilities Measured at Fair Value on a Recurring Basis as of September 30 , 2019
Description	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Liabilities:
Liability related to MT warrants	$	—	$	—	$	63,000	$	63,000

Assets and Liabilities Measured at Fair Value on a Recurring Basis as of December 31, 2018
Description	Quoted Prices in Active Markets for Identical Liabilities (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Total
Assets:
Certificates of deposit	$	—	$	799,270	$	—	$	799,270
Liabilities:
Liability related to MT warrants	$	—	$	—	$	63,000	$	63,000