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8. Accrued business consolidation and restructuring expenses (Details) - Restructuring Accrual Rollforward (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Restructuring Accrual Rollforward [Abstract]
Accrual balance, beginning of period	$ 45,000
Severance & moving charges	138,000	138,000	184,000
Cash payments	$ (183,000)

- Definition

Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

+ References+ Details