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U.S. Tax Reform (Details) - USD ($)
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Sep. 30, 2018
Investments, Owned, Federal Income Tax Note [Line Items]            
Effective Income Tax Rate           24.50%
Income tax expense $ 1,277,000 $ 1,216,000   $ 2,710,000 $ 2,997,000  
Change in tax rate, deferred tax asset, income tax expense (benefit)       $ 551,000    
Deferred Tax Asset            
Investments, Owned, Federal Income Tax Note [Line Items]            
Income tax expense     $ 548,000