Quarterly report pursuant to Section 13 or 15(d)

Line of Credit, Short-Term and Long-Term Borrowings - Long-Term Borrowings (Parenthetical) (Detail)

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Line of Credit, Short-Term and Long-Term Borrowings - Long-Term Borrowings (Parenthetical) (Detail) - Jun. 30, 2015 - Notes payable to banks [Member] - USD ($)
Total
Modified loan agreement [Member]  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 338,000
Variable interest rate of note payable 3.94%
Balloon payment required under note payable $ 77,060,000
Due date for note payable 2015-10
Frequency of periodic payment Monthly
Master agreement one [Member]  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 531,400
Fixed interest rate of note payable 3.54%
Balloon payment required under note payable $ 12,635,000
Due date for note payable 2015-12
Frequency of periodic payment Monthly
Master agreement two [Member]  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 483,900
Fixed interest rate of note payable 3.19%
Balloon payment required under note payable $ 11,670,000
Due date for note payable 2016-06
Frequency of periodic payment Monthly
Equipment agreement [Member]  
Debt Instrument [Line Items]  
Monthly repayment installment of note payable $ 30,500
Fixed interest rate of note payable 5.24%
Due date for note payable 2019-07
Frequency of periodic payment Monthly