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REVENUE FROM CONTRACTS WITH CUSTOMERS - Narrative (Details) - USD ($)
Mar. 31, 2019
Oct. 01, 2018
Sep. 30, 2018
Disaggregation of Revenue [Line Items]      
Retained earnings $ 258,600,000   $ 213,048,000
Accounting Standards Update 2014-09      
Disaggregation of Revenue [Line Items]      
Cumulative Effect of New Accounting Principle in Period of Adoption   $ 1,502,000  
Refund Transfer Fees      
Disaggregation of Revenue [Line Items]      
Accounts Receivable, Gross, Current $ 0   $ 827,039