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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

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

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