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Unaudited Condensed Consolidated Statements of Changes in Shareholders' Equity - USD ($)
Common stock
Treasury Shares
Capital surplus
Accumulated other comprehensive (loss) income
Retained earnings
Total
Balance at Dec. 31, 2019 $ 140,808,923   $ 7,029,488 $ 9,810,478 $ (81,285,895) $ 76,362,994
Balance (in shares) at Dec. 31, 2019 26,790,985          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)         310,299 310,299
Stock-based compensation expenses     173,919     173,919
Buyback of common shares   $ (1,499,586)       (1,499,586)
Buyback of common shares (shares)   (488,029)        
Other comprehensive income (loss)       (114)   (114)
Balance at Mar. 31, 2020 $ 140,808,923 $ (1,499,586) 7,203,407 9,810,364 (80,975,596) 75,347,512
Balance (in shares) at Mar. 31, 2020 26,790,985 (488,029)        
Balance at Dec. 31, 2019 $ 140,808,923   7,029,488 9,810,478 (81,285,895) 76,362,994
Balance (in shares) at Dec. 31, 2019 26,790,985          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)           (255,735)
Balance at Jun. 30, 2020 $ 140,808,923 $ (1,927,198) 7,375,459 9,816,496 (81,541,630) 74,532,050
Balance (in shares) at Jun. 30, 2020 26,790,985 (657,314)        
Balance at Mar. 31, 2020 $ 140,808,923 $ (1,499,586) 7,203,407 9,810,364 (80,975,596) 75,347,512
Balance (in shares) at Mar. 31, 2020 26,790,985 (488,029)        
Increase (Decrease) in Stockholders' Equity            
Net income (loss)         (566,034) (566,034)
Stock-based compensation expenses     172,052     172,052
Buyback of common shares   $ (427,612)       (427,612)
Buyback of common shares (shares)   (169,285)        
Other comprehensive income (loss)       6,132   6,132
Balance at Jun. 30, 2020 $ 140,808,923 $ (1,927,198) 7,375,459 9,816,496 (81,541,630) 74,532,050
Balance (in shares) at Jun. 30, 2020 26,790,985 (657,314)        
Balance at Dec. 31, 2020 $ 131,730,401   7,879,119 9,820,647 (80,410,724) 69,019,443
Balance (in shares) at Dec. 31, 2020 23,985,799          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)         2,735,567 2,735,567
Stock-based compensation expenses     202,499     202,499
Buyback of common shares   $ (492,479)       (492,479)
Buyback of common shares (shares)   (123,200)        
Other comprehensive income (loss)       242   242
Balance at Mar. 31, 2021 $ 131,730,401 $ (492,479) 8,081,618 9,820,889 (77,675,157) 71,465,272
Balance (in shares) at Mar. 31, 2021 23,985,799 (123,200)        
Balance at Dec. 31, 2020 $ 131,730,401   7,879,119 9,820,647 (80,410,724) 69,019,443
Balance (in shares) at Dec. 31, 2020 23,985,799          
Increase (Decrease) in Stockholders' Equity            
Net income (loss)           $ 2,250,542
Buyback of common shares (shares)           (264,215)
Balance at Jun. 30, 2021 $ 131,730,401 $ (1,061,468) 8,317,659 9,819,405 (78,160,182) $ 70,645,815
Balance (in shares) at Jun. 30, 2021 23,985,799 (264,215)        
Balance at Mar. 31, 2021 $ 131,730,401 $ (492,479) 8,081,618 9,820,889 (77,675,157) 71,465,272
Balance (in shares) at Mar. 31, 2021 23,985,799 (123,200)        
Increase (Decrease) in Stockholders' Equity            
Net income (loss)         (485,025) (485,025)
Stock-based compensation expenses     236,041     236,041
Buyback of common shares   $ (568,989)       (568,989)
Buyback of common shares (shares)   (141,015)        
Other comprehensive income (loss)       (1,484)   (1,484)
Balance at Jun. 30, 2021 $ 131,730,401 $ (1,061,468) $ 8,317,659 $ 9,819,405 $ (78,160,182) $ 70,645,815
Balance (in shares) at Jun. 30, 2021 23,985,799 (264,215)