Note 5 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 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 March 31, 2020		126,500	$	8.94		4.6	$	3,209,875
Vested and exercisable at March 31, 2020		94,500	$	4.09		2.9	$	2,825,115