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Retirement and post retirement plans (Tables)
12 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Schedule of Changes in Fair Value of Plan Assets [Table Text Block]
 
2019
2018
Balance July 1,
$851,371
$901,238
Actuarial adjustment
42,505
52,024
Payment of benefits
(101,891)
(101,891)
Balance June 30,
$791,985
$851,371