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Consolidated Statements of Shareholders' Equity - USD ($)
Total
Common Stock
Deferred Equity Compensation
Retained Earnings
Beginning Balance (in shares) at Dec. 31, 2017   3,470,428    
Beginning Balance at Dec. 31, 2017 $ 172,443,820 $ 118,209,111 $ (19,134,963) $ 73,369,672
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants (in shares)   73,025    
Issuance of restricted stock grants 0 $ 13,654,592 (13,654,592)  
Amortization of restricted stock grants 6,664,875   6,664,875  
Issuance of stock grants (in shares)   20,153    
Common stock issued as incentive compensation 4,109,197 $ 4,109,197    
Issuance of common stock related to 401k plan match (in shares)   11,967    
Issuance of common stock related to 401k plan match 2,231,735 $ 2,231,735    
Shares withheld related to employee tax withholding (shares)   (9,918)    
Shares withheld related to employee tax withholding (1,925,700) $ (1,925,700)    
Forfeiture of restricted stock grants (in shares)   (20,900)    
Forfeiture of restricted stock grants 0 $ (4,116,626) 4,116,626  
Cash dividend paid of $6.00 in 2016, $7.00 in 2017, and $8.00 in 2018 per share respectively (28,094,564)     (28,094,564)
Net income attributable to parent 47,375,829     47,375,829
Ending Balance (in shares) at Dec. 31, 2018   3,499,285    
Ending Balance at Dec. 31, 2018 195,575,943 $ 124,933,060 (22,008,054) 92,650,937
Beginning balances attributable to redeemable noncontrolling interests at Dec. 31, 2017 20,076,806      
Increase (Decrease) in Temporary Equity [Roll Forward]        
Net (loss) income attributable to redeemable noncontrolling interests (1,061,441)      
Net subscriptions of consolidated funds 16,444,640      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2018 62,679,687      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants (in shares)   53,969    
Issuance of restricted stock grants 0 $ 7,471,799 (7,471,799)  
Amortization of restricted stock grants 6,584,485   6,584,485  
Issuance of stock grants (in shares)   24,048    
Common stock issued as incentive compensation 3,655,296 $ 3,655,296    
Issuance of common stock related to 401k plan match (in shares)   17,651    
Issuance of common stock related to 401k plan match 2,496,936 $ 2,496,936    
Shares withheld related to employee tax withholding (shares)   (9,928)    
Shares withheld related to employee tax withholding (1,390,482) $ (1,390,482)    
Forfeiture of restricted stock grants (in shares)   (14,200)    
Forfeiture of restricted stock grants 0 $ (2,563,478) 2,563,478  
Repurchases of common stock (in shares)   (276,153)    
Repurchases of common stock (38,749,654) $ (38,749,654)    
Cash dividend paid of $6.00 in 2016, $7.00 in 2017, and $8.00 in 2018 per share respectively (30,275,867)     (30,275,867)
Net income attributable to parent $ 54,959,024     54,959,024
Ending Balance (in shares) at Dec. 31, 2019 3,294,672 3,294,672    
Ending Balance at Dec. 31, 2019 $ 192,855,681 $ 95,853,477 (20,331,890) 117,334,094
Increase (Decrease) in Temporary Equity [Roll Forward]        
Net (loss) income attributable to redeemable noncontrolling interests 4,795,295      
Net subscriptions of consolidated funds 8,095,940      
Net deconsolidations of Company sponsored investments (61,392,098)      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2019 14,178,824      
Increase (Decrease) in Stockholders' Equity [Roll Forward]        
Issuance of restricted stock grants (in shares)   22,099    
Issuance of restricted stock grants 0 $ 2,548,440 (2,548,440)  
Amortization of restricted stock grants 5,227,574   5,227,574  
Issuance of stock grants (in shares)   23,640    
Common stock issued as incentive compensation 3,396,359 $ 3,396,359    
Issuance of common stock related to 401k plan match (in shares)   20,976    
Issuance of common stock related to 401k plan match 2,511,746 $ 2,511,746    
Shares withheld related to employee tax withholding (shares)   (19,189)    
Shares withheld related to employee tax withholding (1,947,456) $ (1,947,456)    
Forfeiture of restricted stock grants (in shares)   (15,625)    
Forfeiture of restricted stock grants 0 $ (2,904,638) 2,904,638  
Repurchases of common stock (in shares)   (157,750)    
Repurchases of common stock (18,646,982) $ (18,646,982)    
Cash dividend paid of $6.00 in 2016, $7.00 in 2017, and $8.00 in 2018 per share respectively (37,976,714)     (37,976,714)
Net income attributable to parent $ 38,660,545     38,660,545
Ending Balance (in shares) at Dec. 31, 2020 3,168,823 3,168,823    
Ending Balance at Dec. 31, 2020 $ 184,080,753 $ 80,810,946 $ (14,748,118) $ 118,017,925
Increase (Decrease) in Temporary Equity [Roll Forward]        
Net (loss) income attributable to redeemable noncontrolling interests (495,407)      
Net subscriptions of consolidated funds (4,311,084)      
Ending balances attributable to redeemable noncontrolling interests at Dec. 31, 2020 $ 9,372,333