Quarterly report pursuant to Section 13 or 15(d)

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

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Nature of Operations and Summary of Significant Accounting Policies - Earnings per Common Share (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Product Information [Line Items]        
Net income $ 344,742 $ 2,683,962 $ 138,945 $ 4,998,657
Weighted average common shares outstanding - basic (in shares) 14,475,825 14,290,697 14,454,738 14,234,929
Effect of dilutive securities:        
Unvested restricted stock and stock options (in shares) 366,991 636,754 432,500 666,934
Weighted average common shares outstanding - diluted (in shares) 14,842,816 14,927,451 14,887,238 14,901,863
Basic earnings per share (in dollars per share) $ 0.02 $ 0.19 $ 0.01 $ 0.35
Diluted earnings per share (in dollars per share) $ 0.02 $ 0.18 $ 0.01 $ 0.34
Restricted stocks        
Effect of dilutive securities:        
Weighted average potentially dilutive securities (in shares) 0 1,576 0 792
Stock options        
Effect of dilutive securities:        
Weighted average potentially dilutive securities (in shares) 43,120 45,825 42,064 30,399