Note 5 - Equity Awards (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

Schedule of Outstanding Warrants [Table Text Block]

	Number of Warrants			Weighted Average Exercise Price
Outstanding at December 31, 2017		710,174		$	8.95
Exercised		(18,405	)		3.00
Forfeited, Canceled		(163,715	)		3.34
Outstanding at December 31, 2018		528,054			10.90
Forfeited, Canceled		(200,801	)		14.18
Outstanding at December 31, 2019		327,253		$	8.89

Share-based Payment Arrangement, Option, Activity [Table Text Block]

	Year ended December 31, 2019
	Total Stock Options Outstanding			Weighted Average Exercise Price per Share		Nonvested Stock Options		Weighted Average Grant Date Fair Value per Share
December 31, 2018		160,076		$	35.92		—	$	—
Forfeited, Canceled		(23,971	)		12.35		—		—
December 31, 2019		136,105		$	40.07		—	$	—

Share-based Compensation Arrangements by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding [Table Text Block]

	Stock Options Outstanding		Vested Stock Options
Quantity		136,105		136,105
Weighted-average exercise price	$	40.07	$	40.07
Weighted Average Remaining Contractual Term (in Years)		3.46		3.46
Intrinsic value	$	—	$	—