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EARNINGS PER COMMON SHARE (Details)
 3 Months Ended 12 Months Ended
Oct. 05, 2018
shares
Sep. 30, 2018
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
$ / shares
Mar. 31, 2018
USD ($)
$ / shares
Dec. 31, 2017
USD ($)
$ / shares
Sep. 30, 2017
USD ($)
$ / shares
Jun. 30, 2017
USD ($)
$ / shares
Mar. 31, 2017
USD ($)
$ / shares
Dec. 31, 2016
USD ($)
$ / shares
Sep. 30, 2016
USD ($)
$ / shares
Jun. 30, 2016
USD ($)
$ / shares
Mar. 31, 2016
USD ($)
$ / shares
Dec. 31, 2015
USD ($)
$ / shares
Sep. 30, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
$ / shares
shares
Sep. 30, 2016
USD ($)
$ / shares
shares
Basic income per common share:                                
Net Income attributable to parent   $ 8,722,000 $ 6,792,000 $ 31,436,000 $ 4,670,000 $ 1,744,000 $ 9,787,000 $ 32,142,000 $ 1,244,000 $ 6,006,000 $ 8,873,000 $ 14,283,000 $ 4,058,000 $ 51,620,000 $ 44,917,000 $ 33,220,000
Weighted average common shares outstanding (in shares)                           $ 30,737,499 $ 27,741,276 $ 25,331,868
Basic income per common share (in dollars per share) | $ / shares   $ 0.24 $ 0.22 $ 1.07 $ 0.15 $ 0.07 $ 0.35 $ 1.15 $ 0.05 $ 0.23 $ 0.35 $ 0.57 $ 0.16 $ 1.68 [1] $ 1.62 [1] $ 1.31 [1]
Diluted income per common share:                                
Net Income attributable to parent   $ 8,722,000 $ 6,792,000 $ 31,436,000 $ 4,670,000 $ 1,744,000 $ 9,787,000 $ 32,142,000 $ 1,244,000 $ 6,006,000 $ 8,873,000 $ 14,283,000 $ 4,058,000 $ 51,620,000 $ 44,917,000 $ 33,220,000
Weighted average common shares outstanding (in shares)                           30,737,499 27,741,276 25,331,868
Outstanding options - based upon the two-class method (in shares)                           $ 115,551 $ 166,956 $ 160,170
Weighted average diluted common shares outstanding (in shares) | shares                           30,853,050 27,908,232 25,492,038
Diluted income per common share (in dollars per share) | $ / shares   $ 0.24 $ 0.22 $ 1.06 $ 0.15 $ 0.07 $ 0.35 $ 1.14 $ 0.05 $ 0.23 $ 0.35 $ 0.56 $ 0.16 $ 1.67 [1] $ 1.61 [1] $ 1.30 [1]
Subsequent Event [Member] | Common Stock [Member]                                
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]                                
Stock split, conversion ratio 3                              
Stock Issued, stock split (in shares) | shares 39,200,000.0                              
[1] All share and per share data for all periods presented has been adjusted to reflect the 3-for-1 forward stock split of the Company's common stock effected by the Company on October 4, 2018.