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 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Product Information [Line Items]        
Net income $ 2,683,962 $ 115,585 $ 4,998,657 $ 930,532
Weighted average common shares outstanding - basic (in shares) 14,290,697 13,980,984 14,234,929 13,935,829
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Unvested restricted stock and stock options (in shares) 636,754 510,655 666,934 551,254
Weighted average common shares outstanding - diluted (in shares) 14,927,451 14,491,639 14,901,863 14,487,083
Basic earnings per share (in dollars per share) $ 0.19 $ 0.01 $ 0.35 $ 0.07
Diluted earnings per share (in dollars per share) $ 0.18 $ 0.01 $ 0.34 $ 0.06
Unvested restricted stock        
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Weighted average potentially dilutive securities (in shares) 1,576 18,557 792 11,318
Stock options        
Incremental Weighted Average Shares Attributable to Dilutive Effect [Abstract]        
Weighted average potentially dilutive securities (in shares) 45,825 174,213 30,399 137,952