Note 4 - Revenue From Contracts With Customers (Tables)

3 Months Ended

Mar. 31, 2018

Notes Tables

Disaggregation of Revenue [Table Text Block]

	Three Months Ended
Category	March 31, 2018		March 31, 2017
Aerospace	$	3,873,833	$	6,758,770
Industrial		3,246,082		974,020
Research		861,200		1,079,062
Point in time		1,172,718		838,765
Net Revenue	$	9,153,833	$	9,650,617