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Note 13 - Revenues - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019
Balance | $ 3,652 | $ 3,532 | $ 3,949 | $ 3,820
Deferral of revenue | 1,324 | 781 | 2,498 | 2,158
Recognition of deferred revenue | (1,428) | (779) | (2,883) | (2,444)
Effect of foreign currency translation | 11 | 16 | (5) | 16
Balance | 3,559 | 3,550 | 3,559 | 3,550
Service [Member] |  |  |  |
Balance | 1,413 | 1,593 | 1,587 | 1,659
Deferral of revenue | 1,126 | 471 | 1,956 | 1,597
Recognition of deferred revenue | (1,041) | (358) | (2,029) | (1,550)
Effect of foreign currency translation | 11 | 16 | (5) | 16
Balance | 1,509 | 1,722 | 1,509 | 1,722
Customer Advances [Member] |  |  |  |
Balance | 2,239 | 1,939 | 2,362 | 2,161
Deferral of revenue | 198 | 310 | 542 | 561
Recognition of deferred revenue | (387) | (421) | (854) | (894)
Effect of foreign currency translation | 0 | 0 | 0 | 0
Balance | $ 2,050 | $ 1,828 | $ 2,050 | $ 1,828

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- Definition Amount of increase (decrease) in revenue recognized for cumulative catch-up adjustment from change in estimate of transaction price which (increases) decreases obligation to transfer good or service to customer for which consideration from customer has been received or is due. Includes, but is not limited to, change in assessment of whether estimate of variable consideration is constrained. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 606 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130551-203045 + Details
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