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Note 13 - Revenues - Changes in Deferred Revenue (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Balance	$ 3,673	$ 3,715	$ 3,949	$ 3,820
Deferral of revenue	643	421	1,174	1,377
Recognition of deferred revenue	(634)	(594)	(1,455)	(1,665)
Effect of foreign currency translation	(30)	(10)	(16)	0
Balance	3,652	3,532	3,652	3,532
Service [Member]
Balance	1,410	1,666	1,587	1,659
Deferral of revenue	522	281	830	1,126
Recognition of deferred revenue	(489)	(344)	(988)	(1,192)
Effect of foreign currency translation	(30)	(10)	(16)	0
Balance	1,413	1,593	1,413	1,593
Customer Advances [Member]
Balance	2,263	2,049	2,362	2,161
Deferral of revenue	121	140	344	251
Recognition of deferred revenue	(145)	(250)	(467)	(473)
Effect of foreign currency translation	0	0	0	0
Balance	$ 2,239	$ 1,939	$ 2,239	$ 1,939

X

- Definition

Amount of deferred income and obligation included in balance of obligation to transfer good or service to customer for which consideration from customer has been received or is due.

+ References

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