Note N - Segment Information - Selected Operating Results (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Revenues	$ 29,034	$ 30,651	$ 57,310	$ 58,762
Income from operations	1,398	1,969	2,262	2,254
Home [Member]
Revenues	14,918	18,658	29,648	36,839
Income from operations	4,167	3,955	8,237	7,762
Unified Communications [Member]
Revenues	8,797	9,791	18,206	18,144
Income from operations	2,696	3,110	5,551	5,263
SmartVoice [Member]
Revenues	5,319	2,202	9,456	3,779
Income from operations	$ (5,465)	$ (5,096)	$ (11,526)	$ (10,771)

Amount, including tax collected from customer, of revenue from satisfaction of performance obligation by transferring promised good or service to customer. Tax collected from customer is tax assessed by governmental authority that is both imposed on and concurrent with specific revenue-producing transaction, including, but not limited to, sales, use, value-added and excise.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 5
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130545-203045

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=118956577&loc=SL49130543-203045

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration