Note 3 - Contracts With Customers 1 (Details Textual) - USD ($)	3 Months Ended
Mar. 31, 2019	Mar. 31, 2018
Revenue, Remaining Performance Obligation, Optional Exemption, Remaining Duration	1 year
Revenue, Remaining Performance Obligation, Amount	$ 524,000
Solutions within the VOC Platform [Member]
Revenue from Contract with Customer, Percent of Total Revenue	57.90%	44.60%

Remaining duration of performance obligation for which optional exemption was applied not to disclose amount of transaction price allocated to and timing of revenue recognition for remaining performance obligation, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 15
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130558-203045

Name:	us-gaap_RevenueRemainingPerformanceObligationOptionalExemptionRemainingDuration
Namespace Prefix:	us-gaap_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	instant