Employee Retirement Benefits (Tables)

12 Months Ended

Jun. 30, 2018

Retirement Benefits [Abstract]

Schedule of Costs of Retirement Plans [Table Text Block]

PPA Zone Status

Contributions by the Company

FIP/RP

Status

Pending/

Surcharge

Expiration

Pension Trust Fund

EIN/PN

2017

2016

Implemented

2018

2017

2016

Imposed

Date of CBA

District No. 9

51-0138317/001

Green

Green

International Association of Machinist and Aerospace Workers Pension Plan

12/31/2017

12/31/2016

N/A

$

269,928

$

277,127

$

279,968

No

5/31/2021