Annual report pursuant to Section 13 and 15(d)

Nature of Operations and Summary of Significant Accounting Policies - Earnings (Loss) Per Common Share (Details)

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Nature of Operations and Summary of Significant Accounting Policies - Earnings (Loss) Per Common Share (Details) - USD ($)
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Product Information [Line Items]    
Net income $ 13,167,314 $ 3,323,712
Weighted average common shares outstanding - basic (in shares) 14,003,708 13,819,149
Effect of dilutive securities:    
Unvested restricted stock and stock options (in shares) 579,169 648,418
Weighted average common shares outstanding - diluted (in shares) 14,582,877 14,467,567
Basic earnings per share (in dollars per share) $ 0.94 $ 0.24
Diluted earnings per share (in dollars per share) $ 0.90 $ 0.23
Unvested restricted stock    
Effect of dilutive securities:    
Potentially dilutive securities excluded from calculation of diluted net income per common share (in shares) 0 0
Stock options    
Effect of dilutive securities:    
Potentially dilutive securities excluded from calculation of diluted net income per common share (in shares) 94,294 39,286