Note 5 - Stock-based Compensation (Tables)

9 Months Ended

Sep. 30, 2018

Notes Tables

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

	# of Shares		Wgt. Avg. Exercise Price		Wgt. Avg. Remaining Contractual Life in Years		Aggregate Intrinsic Value
Outstanding at September 30, 2018		227,500	$	2.47		4.9	$	1,843,765
Vested and exercisable at September 30, 2018		199,000	$	2.03		4.3	$	1,700,110