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Note 17 - Segment Information (Details Textual)	12 Months Ended
Note 17 - Segment Information (Details Textual)	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Number of Reportable Segments	3
Product Concentration Risk [Member] \| Revenue Benchmark [Member] \| Home [Member] \| Telephony [Member]
Concentration Risk, Percentage	37.00%	45.00%	54.00%
Product Concentration Risk [Member] \| Revenue, Segment Benchmark [Member] \| Home [Member] \| Smart Home [Member]
Concentration Risk, Percentage	14.00%	12.00%	14.00%
Product Concentration Risk [Member] \| Revenue, Segment Benchmark [Member] \| Office [Member] \| VoIP [Member]
Concentration Risk, Percentage	32.00%	33.00%	28.00%
Product Concentration Risk [Member] \| Revenue, Segment Benchmark [Member] \| SmartVoice [Member] \| HDClear [Member]
Concentration Risk, Percentage	16.00%