Quarterly report pursuant to Section 13 or 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 ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Product Information [Line Items]        
Net income $ 1,937,095 $ 1,603,959 $ 6,935,751 $ 2,534,491
Weighted average common shares outstanding - basic (in shares) 14,388,905 14,033,535 14,286,818 13,968,635
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Unvested restricted stock and stock options (in shares) 581,423 559,572 644,941 554,694
Weighted average common shares outstanding - diluted (in shares) 14,970,328 14,593,107 14,931,759 14,523,329
Basic earnings per share (in dollars per share) $ 0.13 $ 0.11 $ 0.49 $ 0.18
Diluted earnings per share (in dollars per share) $ 0.13 $ 0.11 $ 0.46 $ 0.17
Unvested restricted stock        
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Weighted average potentially dilutive securities (in shares) 0 0 0 0
Stock options        
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Weighted average potentially dilutive securities (in shares) 601 112,768 35,293 133,194