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Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2019
Jun. 30, 2019
Assets    
Total available for sale securities $ 10,077 $ 7,479
Fair Value, Recurring    
Assets    
Money market funds (cash and cash equivalents) 263 2,807
Total assets 10,340 10,286
Liabilities    
Total liabilities 1,962 1,285
Fair Value, Recurring | Interest Rate Swap    
Liabilities    
Short-term derivative interest rate swap 233 37
Long-term derivative interest rate swap 1,729 1,248
Fair Value, Recurring | Government - U.S.    
Assets    
Total available for sale securities 10,077 7,479
Fair Value, Recurring | Level 1    
Assets    
Money market funds (cash and cash equivalents) 263 2,807
Total assets 263 2,807
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 1 | Interest Rate Swap    
Liabilities    
Short-term derivative interest rate swap 0 0
Long-term derivative interest rate swap 0 0
Fair Value, Recurring | Level 1 | Government - U.S.    
Assets    
Total available for sale securities 0 0
Fair Value, Recurring | Level 2    
Assets    
Money market funds (cash and cash equivalents) 0 0
Total assets 10,077 7,479
Liabilities    
Total liabilities 1,962 1,285
Fair Value, Recurring | Level 2 | Interest Rate Swap    
Liabilities    
Short-term derivative interest rate swap 233 37
Long-term derivative interest rate swap 1,729 1,248
Fair Value, Recurring | Level 2 | Government - U.S.    
Assets    
Total available for sale securities 10,077 7,479
Fair Value, Recurring | Level 3    
Assets    
Money market funds (cash and cash equivalents) 0 0
Total assets 0 0
Liabilities    
Total liabilities 0 0
Fair Value, Recurring | Level 3 | Interest Rate Swap    
Liabilities    
Short-term derivative interest rate swap 0 0
Long-term derivative interest rate swap 0 0
Fair Value, Recurring | Level 3 | Government - U.S.    
Assets    
Total available for sale securities $ 0 $ 0