Bank Loan, Lines of Credit and Loan Payable - Related Party - Additional Information (Detail) - USD ($)		1 Months Ended	12 Months Ended
	Feb. 04, 2016	Feb. 13, 2014	Dec. 31, 2017	Dec. 31, 2016	Feb. 28, 2018	Apr. 07, 2017	Mar. 03, 2017	Apr. 22, 2016	Apr. 21, 2016	Jul. 01, 2015	Jan. 13, 2014	Apr. 30, 2012	Dec. 31, 2010
Short-term Bank Loans and Notes Payable			$ 510,391	$ 0
Interest Expense			79,689	61,589
Due to Related Parties										$ 600,000
Repayments of Related Party Debt			$ 0	$ 600,000
ICC [Member]
Debt Instrument, Face Amount													$ 4,600,000
Debt Instrument, Interest Rate, Stated Percentage			4.50%
Short-term Bank Loans and Notes Payable			$ 510,391
Debt Instrument, Maturity Date			Dec. 31, 2018
APC [Member]
Debt Instrument, Face Amount											$ 1,575,000
Debt Instrument, Interest Rate, Stated Percentage											4.63%
Debt Instrument, Periodic Payment		$ 10,132
Interest Expense	$ 44,200
Long-term Line of Credit			$ 5,000,000
Debt Instrument, Frequency of Periodic Payment		239 monthly payments
Line of Credit Facility, Interest Rate Description			“prime rate” plus 0.125%
APC [Member] | Standby Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 305,016
Line of Credit Facility, Description			The standby letters of credit are automatically extended without amendment for additional one - year periods from the present or any future expiration date, unless notified by the institution to terminate prior to 90 days from any expiration date.
NMM Business Loan Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity						$ 20,000,000						$ 10,000,000
Line of Credit Facility, Interest Rate at Period End			4.625%	3.875%
Line of Credit Facility, Expiration Date			Apr. 22, 2018
Long-term Line of Credit			$ 5,000,000
Line of Credit Facility, Remaining Borrowing Capacity			8,300,671
Line of Credit Facility, Guarantee Given by Related Parties			$ 1,000,000
APC Business Loan Agreement [Member]
Line of Credit Facility, Maximum Borrowing Capacity								$ 10,000,000	$ 2,000,000
Line of Credit Facility, Interest Rate at Period End			4.625%	3.875%
Line of Credit Facility, Remaining Borrowing Capacity			$ 9,694,984
Line of Credit Facility, Interest Rate Description			“prime rate” plus 0.125%
Line of Credit Facility, Guarantee Given by Related Parties			$ 1,000,000
BAHA [Member]
Line of Credit Facility, Interest Rate at Period End			4.50%	3.75%
Line of Credit Facility, Expiration Date			Mar. 31, 2017
Long-term Line of Credit			$ 25,000
Line of Credit Facility, Interest Rate Description			prime rate (as defined) plus 3.0%
Line of Credit Facility, Floor Interest Rate			3.25%
BAHA [Member] | Subsequent Event [Member]
Line of Credit Facility, Maximum Borrowing Capacity					$ 150,000
APAACO [Member] | Standby Letters of Credit [Member]
Line of Credit Facility, Maximum Borrowing Capacity							$ 6,699,329
Line of Credit Facility, Expiration Date			Dec. 31, 2018
Line of Credit Facility, Description			The letter of credit expires on December 31, 2018 and deemed automatically extended without amendment for additional one - year periods from the present or any future expiration date, unless notified by the institution to terminate prior to 90 days from any expiration date