DEBT - Borrowing Under Term Loan (Details) - Texas Capital Bank, National Association (TCB) - Revolving Credit Facility - Credit Agreement - USD ($)	Apr. 01, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-Term Debt, Gross, Initial Borrowing	$ 687,500	$ 687,500
Debt Instrument, Interest Rate, Effective Percentage for Initial Borrowing Amount	5.50%	5.50%
Long-Term Debt, Gross, Second Borrowing Amount	$ 6,500,000	$ 6,500,000
Debt Instrument, Interest Rate, Effective Percentage for Second Borrowing Amount	4.70%	4.34%
Long-Term Debt, Gross, Third Borrowing Amount	$ 6,500,000	$ 6,500,000
Debt Instrument, Interest Rate, Effective Percentage for Third Borrowing Amount	4.79%	4.38%
Long-Term Debt, Gross, Fourth Borrowing Amount	$ 6,000,000	$ 6,000,000
Debt Instrument, Interest Rate, Effective Percentage for Fourth Borrowing Amount	5.02%	4.49%
Long-Term Debt, Gross, Fifth Borrowing Amount	$ 3,587,500	$ 4,200,000
Debt Instrument, Interest Rate, Effective Percentage for Fifth Borrowing Amount	5.22%	4.64%
Long-term debt, less current portion	$ 23,275,000	$ 23,887,500