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Other Long-term Liabilities	12 Months Ended
	Dec. 31, 2017
Other Liabilities Disclosure [Abstract]
Other Long-term Liabilities	Other Long-term Liabilities We entered into a purchase agreement with a vendor on July 30, 2008 pursuant to which we agreed to purchase up to $4.8 million of our paint and coating requirements exclusively from the vendor.  In connection with the execution of the agreement, the vendor paid us a $300,000 fee which is considered to be a discount toward future purchases from the vendor.  The $300,000 payment we received is recorded as a long-term liability and will decrease as the purchase commitment is fulfilled.  The long-term liability remaining for the purchase commitment was  $92,000 and $115,000 as of December 31, 2017 and 2016, respectively.

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- References

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- Definition

The entire disclosure for other liabilities.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.20,24)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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