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Retirement and post retirement plans (Tables)
12 Months Ended
Jun. 30, 2020
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]  
Schedule of Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits by Title of Individual and Type of Deferred Compensation [Table Text Block]
 
2020
 
2019
Balance July 1,
$
791,985

 
$
851,371

Actuarial adjustment
(758,021
)
 
42,505

Payment of benefits
(33,964
)
 
(101,891
)
Balance June 30,

 
791,985