Retirement Agreements and Other Postretirement Benefit Plan Amounts in Accumulated Other Comprehensive Income, Pre-tax, to be Recognized as Components of Net Periodic Benefit Costs (Details)	12 Months Ended
Dec. 31, 2016 USD ($)
Compensation and Retirement Disclosure [Abstract]
Amortization of unrecognized prior service cost	$ 0
Amortization of unrecognized loss	8,612
Net periodic benefit cost at end of year	$ 8,612

Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

No definition available.

Name:	us-gaap_DefinedBenefitPlanAmountToBeAmortizedFromAccumulatedOtherComprehensiveIncomeLossNextFiscalYear
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration