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Supplementary Balance Sheet Information (Details Textual) - USD ($) $ in Millions	Dec. 31, 2017	Dec. 31, 2016
Supplementary Balance Sheet Information (Textual)
Cash and cash equivalents	$ 7.2	$ 8.6
Weighted average annual interest rate	1.57%

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- References

No definition available.

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- Definition

The weighted average interest rate for highly liquid bank deposits.

+ References

No definition available.

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- Definition

Amount of short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates. Excludes cash and cash equivalents within disposal group and discontinued operation.

+ 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 210.5-02.1)
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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