Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Reconciliation of Shares Used in Calculating Basic and Diluted Earnings per Common Shares (Details)

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Summary of Significant Accounting Policies - Reconciliation of Shares Used in Calculating Basic and Diluted Earnings per Common Shares (Details) - shares
12 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]    
Basic weighted average shares outstanding 7,031,500 7,031,400
Effect of common stock equivalents — stock issuable under outstanding equity awards 49,000 54,000
Diluted weighted average shares outstanding 7,080,500 7,085,300