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Consolidated Condensed Statement of Changes in Stockholders' Equity - USD ($)
Total
Common Stock
Additional Paid-in Capital
Retained Earnings
Treasury Stock
Beginning Balance (in shares) at Jun. 30, 2019   33,183,730      
Beginning Balance at Jun. 30, 2019 $ 80,125,858 $ 33,183 $ 42,488,913 $ 37,603,762 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   271,778      
Issuance of restricted common stock 0 $ 272 (272)    
Forfeitures of restricted stock (in shares)   (49,118)      
Forfeitures of restricted stock 0 $ (49) 49    
Common share repurchases, including shares surrendered for tax withholding (2,483,357)       (2,483,357)
Retirements of treasury stock (in shares)   (449,921)      
Retirements of treasury stock 0 $ (450) (2,482,907)   2,483,357
Stock-based compensation 926,794   926,794    
Net income (loss) attributable to common stockholders 8,267,897     8,267,897  
Common stock cash dividends (9,916,841)     (9,916,841)  
Ending Balance (in shares) at Mar. 31, 2020   32,956,469      
Ending Balance at Mar. 31, 2020 76,920,351 $ 32,956 40,932,577 35,954,818 0
Beginning Balance (in shares) at Dec. 31, 2019   33,106,988      
Beginning Balance at Dec. 31, 2019 76,879,766 $ 33,107 41,306,353 35,540,306 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Common share repurchases, including shares surrendered for tax withholding (732,518)       (732,518)
Retirements of treasury stock (in shares)   (150,519)      
Retirements of treasury stock 0 $ (151) (732,367)   732,518
Stock-based compensation 358,591   358,591    
Net income (loss) attributable to common stockholders 3,710,159     3,710,159  
Common stock cash dividends (3,295,647)     (3,295,647)  
Ending Balance (in shares) at Mar. 31, 2020   32,956,469      
Ending Balance at Mar. 31, 2020 $ 76,920,351 $ 32,956 40,932,577 35,954,818 0
Beginning Balance (in shares) at Jun. 30, 2020 32,956,469 32,956,469      
Beginning Balance at Jun. 30, 2020 $ 74,124,482 $ 32,956 41,291,446 32,800,080 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   553,615      
Issuance of restricted common stock 0 $ 554 (554)    
Common share repurchases, including shares surrendered for tax withholding (7,348)       (7,348)
Retirements of treasury stock (in shares)   (2,632)      
Retirements of treasury stock 0 $ (3) (7,345)   7,348
Stock-based compensation 938,093   938,093    
Net income (loss) attributable to common stockholders (18,654,154)     (18,654,154)  
Common stock cash dividends $ (2,666,334)     (2,666,334)  
Ending Balance (in shares) at Mar. 31, 2021 33,507,452 33,507,452      
Ending Balance at Mar. 31, 2021 $ 53,734,739 $ 33,507 42,221,640 11,479,592 0
Beginning Balance (in shares) at Dec. 31, 2020   33,490,550      
Beginning Balance at Dec. 31, 2020 53,228,726 $ 33,490 41,901,421 11,293,815 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Issuance of restricted common stock (in shares)   16,902      
Issuance of restricted common stock 0 $ 17 (17)    
Stock-based compensation 320,236   320,236    
Net income (loss) attributable to common stockholders 1,191,001     1,191,001  
Common stock cash dividends $ (1,005,224)     (1,005,224)  
Ending Balance (in shares) at Mar. 31, 2021 33,507,452 33,507,452      
Ending Balance at Mar. 31, 2021 $ 53,734,739 $ 33,507 $ 42,221,640 $ 11,479,592 $ 0