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EQUITY - Exercise of stock options (Details) - USD ($)
1 Months Ended 9 Months Ended
Sep. 09, 2021
Aug. 21, 2021
Aug. 20, 2021
Jul. 12, 2021
Jul. 09, 2021
May 28, 2021
May 25, 2021
Apr. 21, 2021
Apr. 12, 2021
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Common stock, par value                     $ 0.001   $ 0.001
Purchase of investments in cultural projects                     $ 500,000 $ 0  
Carrying amount of investment                     10,630,120   $ 0
Securities Purchase Agreement                          
Number of shares issued       571,429                  
Gross proceeds       $ 5,000,000                  
Number of shares acquired           86,560              
Purchase of investments in cultural projects     $ 500,000     $ 500,000              
Restricted shares issued 1,558,480 1,558,480       572,000              
Price per restricted shares $ 6.5                        
Carrying amount of investment $ 10,630,120                   $ 10,630,120    
Securities Purchase Agreement | Institutional Investor                          
Price per share       $ 8.75                  
Advisory Agreement                          
Number of shares awarded         160,000                
Share-based compensation expense         $ 1,897,600                
2015 Incentive Stock Plan                          
Share-based compensation expense                   $ 6,863,815      
Restricted shares issued               335,000          
2015 Incentive Stock Plan | Advisory Agreement                          
Exercise price per share         $ 11.86                
Common stock [Member]                          
Exercise of stock options (in shares)             5,065   56,000   61,065    
Common stock [Member] | Securities Purchase Agreement                          
Common stock, par value       $ 0.001