Schedule I - Valuation and Qualifying Accounts (Detail) - USD ($)	12 Months Ended
Dec. 31, 2015	Dec. 31, 2014
Allowance for Doubtful Accounts (Deducted from Accounts Receivable) [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	$ 544,932	$ 499,865
Charged to Costs and Expenses	695,246	589,270
Deductions	643,798	544,203
Balance at End of Period	596,380	544,932
Valuation Allowance for Deferred Tax Assets [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at Beginning of Period	630,775	634,108
Deductions	36,696	3,333
Balance at End of Period	$ 594,079	$ 630,775

Total of allowances and reserves, the valuation and qualifying accounts that are either netted against the cost of an asset (in order to value it at its carrying value) or that reflect a liability established to represent expected future costs.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 09
-Article 12

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