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Long-term Debt (Details Narrative) - USD ($) |  | 3 Months Ended |
--- | --- | --- | ---
Oct. 31, 2011 | Mar. 31, 2018 | Dec. 31, 2017
Letters of credit outstanding, amount |  |  | $ 2,660,000 |
Term Loan [Member] |  |  |  |
Long-term debt | [1],[2] |  | 3,551,000 | $ 3,847,000
PNC Bank [Member] | Term Loan [Member] |  |  |  |
Number of years used to determine monthly payment on term loan |  | 7 years |  |
Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |  |
Debt instrument, termination notice |  | 90 days |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | On or Before March 23, 2017 [Member] |  |  |  |
Debt instrument percentage of total financing to be paid upon early retirement of debt obligations |  | 1.00% |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2017 But Prior to or on March 23, 2018 [Member] |  |  |  |
Debt instrument percentage of total financing to be paid upon early retirement of debt obligations |  | 0.50% |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2018 But Prior to or on March 23, 2019 [Member] |  |  |  |
Debt instrument percentage of total financing to be paid upon early retirement of debt obligations |  | 0.25% |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | After March 23, 2019 [Member] |  |  |  |
Debt instrument percentage of total financing to be paid upon early retirement of debt obligations |  | 0.00% |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] |  |  |  |
Long-term debt |  | $ 6,100,000 |  |
Debt instrument, periodic payment, principal |  | $ 101,600 |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | Prime Rate [Member] |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.50% |  |
Revised Loan Agreement [Member] | PNC Bank [Member] | Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.50% |  |
Amendment to the Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |  |
Indefinite reduction of borrowing availability |  |  | 2,000,000 |
Revolving Credit Facility [Member] | PNC Bank [Member] |  |  |  |
Line of credit facility, remaining borrowing capacity |  |  | 2,823,000 |
Letters of credit outstanding, amount |  |  | $ 2,660,000 |
Revolving Credit Facility [Member] | Revised Loan Agreement [Member] | PNC Bank [Member] |  |  |  |
Debt maturity date |  | Mar. 24, 2021 |  |
Line of credit facility, maximum borrowing capacity |  | $ 12,000,000 |  |
Revolving Credit Facility [Member] | Revised Loan Agreement [Member] | PNC Bank [Member] | Prime Rate [Member] |  |  |  |
Debt instrument, basis spread on variable rate |  | 2.00% |  |
Revolving Credit Facility [Member] | Revised Loan Agreement [Member] | PNC Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |
Debt instrument, basis spread on variable rate |  | 3.00% |  |
[1] | Net of debt issuance costs of ($107,000) and ($115,000) at March 31, 2018 and December 31, 2017, respectively.
[2] | Our revolving credit facility is collateralized by our accounts receivable and our term loan is collateralized by our property, plant, and equipment.

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