Quarterly report pursuant to Section 13 or 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
3 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share [Abstract]    
Basic weighted average shares outstanding 7,034,700 7,031,400
Effect of common stock equivalents — stock issuable under outstanding equity awards 440,000 60,000
Diluted weighted average shares outstanding 7,475,000 7,091,000