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UNAUDITED CONSOLIDATED STATEMENT OF STOCKHOLDERS' EQUITY - USD ($)
Total
Preferred Stock
Common Stock
Treasury Stock Amount
Additional Paid in Capital
Retained Earnings
Stockholders’ equity, beginning balance at Dec. 31, 2017 $ 39,134,679 $ 0 $ 87,594 $ 0 $ 37,675,329 $ 1,371,756
Stockholders’ equity, beginning balance (in shares) at Dec. 31, 2017     8,759,376      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 67,029       67,029  
Exercise of common stock options and warrants (in shares)     4,589      
Exercise of common stock options and warrants (7,500)   $ 46   (7,546)  
Cash dividend declared (2,189,844)         (2,189,844)
Net income (loss) 2,465,571         2,465,571
Stockholders’ equity, ending balance at Apr. 01, 2018 39,469,935 0 $ 87,640 0 37,734,812 1,647,483
Stockholders’ equity, ending balance (in shares) at Apr. 01, 2018     8,763,965      
Stockholders’ equity, beginning balance at Dec. 31, 2017 39,134,679 0 $ 87,594 0 37,675,329 1,371,756
Stockholders’ equity, beginning balance (in shares) at Dec. 31, 2017     8,759,376      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Option cancellation agreement 3,335,169          
Net income (loss) 12,696,841          
Stockholders’ equity, ending balance at Sep. 30, 2018 62,854,432 0 $ 101,579 (24,027) 56,563,068 6,213,812
Stockholders’ equity, ending balance (in shares) at Sep. 30, 2018     10,157,877      
Stockholders’ equity, beginning balance at Apr. 01, 2018 39,469,935 0 $ 87,640 0 37,734,812 1,647,483
Stockholders’ equity, beginning balance (in shares) at Apr. 01, 2018     8,763,965      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 47,807       47,807  
Issuance of shares, net of offering costs (in shares)     1,293,750      
Issuance of shares, net of offering costs 21,386,013   $ 12,938   21,373,075  
Exercise of common stock options and warrants (in shares)     31,314      
Exercise of common stock options and warrants 11,069   $ 312   10,757  
Option cancellation agreement (3,335,169)       (3,335,169)  
Cash dividend declared (2,638,232)         (2,638,232)
Net income (loss) 5,169,884         5,169,884
Stockholders’ equity, ending balance at Jul. 01, 2018 60,111,307 0 $ 100,890 0 55,831,282 4,179,135
Stockholders’ equity, ending balance (in shares) at Jul. 01, 2018     10,089,029      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 758,350       758,350  
Issuance of shares, net of offering costs (in shares)     0      
Issuance of shares, net of offering costs (25,875)   $ 0   (25,875)  
Issuance of restricted shares, net of 828 shares of treasury stock (shares)     41,172      
Issuance of restricted shares, net of 828 shares of treasury stock (24,027)   $ 412 (24,027) (412)  
Exercise of common stock options and warrants (in shares)     27,676      
Exercise of common stock options and warrants 0   $ 277   (277)  
Cash dividend declared (3,026,709)         (3,026,709)
Net income (loss) 5,061,386         5,061,386
Stockholders’ equity, ending balance at Sep. 30, 2018 62,854,432 0 $ 101,579 (24,027) 56,563,068 6,213,812
Stockholders’ equity, ending balance (in shares) at Sep. 30, 2018     10,157,877      
Stockholders’ equity, beginning balance at Dec. 30, 2018 65,702,013 0 $ 102,273 (24,027) 57,624,379 7,999,388
Stockholders’ equity, beginning balance (in shares) at Dec. 30, 2018     10,227,247      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 320,084       320,084  
Cancellation of restricted shares (in shares)     (2,250)      
Cancellation of restricted shares 0   $ (23)   23  
Exercise of common stock options and warrants (in shares)     4,916      
Exercise of common stock options and warrants 0   $ 49   (49)  
Change in accounting principal - operating leases (200,607)         (200,607)
Cash dividend declared (3,068,847)         (3,068,847)
Net income (loss) 2,496,024         2,496,024
Stockholders’ equity, ending balance at Mar. 31, 2019 65,248,667 0 $ 102,299 (24,027) 57,944,437 7,225,958
Stockholders’ equity, ending balance (in shares) at Mar. 31, 2019     10,229,913      
Stockholders’ equity, beginning balance at Dec. 30, 2018 65,702,013 0 $ 102,273 (24,027) 57,624,379 7,999,388
Stockholders’ equity, beginning balance (in shares) at Dec. 30, 2018     10,227,247      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Option cancellation agreement 0          
Net income (loss) 10,505,023          
Stockholders’ equity, ending balance at Sep. 29, 2019 67,586,108 0 $ 102,421 (27,318) 58,416,884 9,094,121
Stockholders’ equity, ending balance (in shares) at Sep. 29, 2019     10,242,114      
Stockholders’ equity, beginning balance at Mar. 31, 2019 65,248,667 0 $ 102,299 (24,027) 57,944,437 7,225,958
Stockholders’ equity, beginning balance (in shares) at Mar. 31, 2019     10,229,913      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 186,629       186,629  
Exercise of common stock options and warrants (in shares)     4,805      
Exercise of common stock options and warrants 0   $ 48   (48)  
Cash dividend declared (3,068,974)         (3,068,974)
Net income (loss) 3,801,829         3,801,829
Stockholders’ equity, ending balance at Jun. 30, 2019 66,168,151 0 $ 102,347 (24,027) 58,131,018 7,958,813
Stockholders’ equity, ending balance (in shares) at Jun. 30, 2019     10,234,718      
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Share-based compensation 244,450       244,450  
Exercise of common stock options and warrants (in shares)     7,396      
Exercise of common stock options and warrants 38,199   $ 74 (3,291) 41,416  
Cash dividend declared (3,071,862)         (3,071,862)
Net income (loss) 4,207,170         4,207,170
Stockholders’ equity, ending balance at Sep. 29, 2019 $ 67,586,108 $ 0 $ 102,421 $ (27,318) $ 58,416,884 $ 9,094,121
Stockholders’ equity, ending balance (in shares) at Sep. 29, 2019     10,242,114