Note 7 - Share-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

Notes Tables

Schedule of Share-based Payment Award, Stock Options, Valuation Assumptions [Table Text Block]

	Three Months Ended
	March 31, 2017
Expected volatility		96.4%
Expected dividends		None
Exercise price		$42.65
Expected term (in years)		5.7
Risk-free rate		2.03%