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Note 2 - Revenue Recognition - Contract Liabilities (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Deferred revenue - January 1, 2018	$ 871,000
Acquired in Dielectrics business combination	2,175,000
Increases due to consideration received from customers	658,000	$ 68,000
Revenue recognized - Q1 2018	(314,000)
Deferred revenue - March 31, 2018	$ 3,130,000

X

- Definition

Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

+ References

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X

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration from customer has been received or is due, from business combination.

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- Definition

Amount of revenue recognized that was previously included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

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Amount of increase (decrease) in obligation to transfer good or service to customer for which consideration has been received or is receivable.

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