Note 3 - Stock-based Compensation (Tables)

3 Months Ended

Mar. 31, 2017

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, 2017		304,500	$	2.06		5.0	$	742,020
Vested and exercisable at March 31, 2017		256,500	$	1.76		4.2	$	702,540