Note 5 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2020

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 June 30, 2020		126,500	$	8.94		4.3	$	3,220,540
Vested and exercisable at June 30, 2020		102,500	$	5.61		3.1	$	2,938,740