Note 4 - Stock-based Compensation (Tables)

6 Months Ended

Jun. 30, 2016

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, 2016		286,500	$	1.83		5.2	$	541,530
Vested and exercisable at June 30, 2016		268,500	$	1.74		4.9	$	534,390