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Income Taxes, Income Tax Uncertainties (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended 12 Months Ended
Dec. 31, 2017
Dec. 31, 2018
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2018
Jun. 30, 2017
Income Tax Uncertainties [Abstract]            
Federal corporate tax rate     21.00%   28.10% 34.00%
Income tax benefit resulting from re-measurement of deferred taxes $ (251)          
Uncertain tax positions     $ 0   $ 0 $ 0
Unrecaptured pre-1988 Federal bad debt reserve     $ 1,800   $ 1,800  
Maximum [Member]            
Income Tax Uncertainties [Abstract]            
Federal corporate tax rate       35.00%    
Plan [Member]            
Income Tax Uncertainties [Abstract]            
Federal corporate tax rate   21.00%        
Federal [Member]            
Income Tax Uncertainties [Abstract]            
Open tax year         2015 2017  
New York State [Member]            
Income Tax Uncertainties [Abstract]            
Open tax year         2015 2017