Line of Credit	9 Months Ended
Sep. 30, 2018
Debt Disclosure [Abstract]
Line of Credit	Line of Credit We have a $10.0 million revolving line of credit with a domestic bank. At both September 30, 2018 and December 31, 2017, there were no borrowings under the line. Under the terms of the line of credit, available borrowings are reduced by outstanding letters of credit. As of September 30, 2018, we had letters of credit outstanding of $3.1 million under the facility, and available borrowing of $6.9 million. The line is secured by substantially all of our assets, and bears interest at varying rates (currently LIBOR plus 1.25% or Prime less 0.50%). The line of credit matures on December 31, 2018, and requires monthly payments of interest only. Our agreement with the bank requires us to comply with a maximum funded debt to earnings before interest, taxes, depreciation and amortization ("EBITDA") ratio, as defined, of no greater than 2.00 to 1.00 based upon a trailing twelve-month period. At September 30, 2018, our funded debt to EBITDA ratio was 0.001 to 1.00.

Line of Credit

9 Months Ended

Sep. 30, 2018

We have a $10.0 million revolving line of credit with a domestic bank. At both September 30, 2018 and December 31, 2017, there were no borrowings under the line. Under the terms of the line of credit, available borrowings are reduced by outstanding letters of credit. As of September 30, 2018, we had letters of credit outstanding of $3.1 million under the facility, and available borrowing of $6.9 million. The line is secured by substantially all of our assets, and bears interest at varying rates (currently LIBOR plus 1.25% or Prime less 0.50%). The line of credit matures on December 31, 2018, and requires monthly payments of interest only. Our agreement with the bank requires us to comply with a maximum funded debt to earnings before interest, taxes, depreciation and amortization ("EBITDA") ratio, as defined, of no greater than 2.00 to 1.00 based upon a trailing twelve-month period. At September 30, 2018, our funded debt to EBITDA ratio was 0.001 to 1.00.