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Defined Benefit Pension Plan - Amounts recognized (Details) - USD ($)
Jun. 30, 2021
Jun. 30, 2020
Defined Benefit Pension Plan    
Pension asset (liability) $ 97,021 $ (3,094,483)
Amounts recognized in accumulated other comprehensive loss consist of:    
Accumulated pension actuarial loss, net of income tax benefit of $1,522,485 and $1,522,485, respectively 1,552,435 4,853,355
Accumulated pension actuarial loss, net of income tax benefit $ 1,522,485 $ 1,522,485