Note 9 - Discontinued Operations - Combined Balance Sheets (Details) - USD ($) $ in Thousands		Feb. 03, 2018	Jan. 28, 2017	Jan. 30, 2016	Jan. 31, 2015
Cash and cash equivalents		$ 38,628	$ 64,425	$ 63,790	$ 83,502
Restricted cash
Accounts receivable, net of allowance for doubtful accounts of $2,022 as of February 3, 2018 and $1,630 as of January 28, 2017		9,715	19,986
Inventory		3,038	9,463
Prepaid expenses and other current assets		6,771	6,878
Current assets held for sale		21,893	28,000
Total current assets		80,045	133,533
Software, equipment and leasehold improvements, net		4,339	11,258
Intangible assets, net		2,551	28,305
Goodwill			10,594
Deferred tax assets
Non-current assets held for sale		4,703	10,370
Other non-current assets		4,459	5,747
Total assets		96,097	201,807
Accounts payable		9,333	8,312
Accrued compensation and related benefits		4,048	5,518
Accrued liabilities		9,867	8,845
Current liabilities held for sale		13,807	13,289
Total current liabilities		37,055	35,964
Income taxes payable		11,580	14,117
Deferred tax liabilities		45	320
Long-term liabilities held for sale		4,144	1,642
Other long-term liabilities		3,153	6,218
Total liabilities		55,977	58,261
Common stock and additional paid-in capital		522,985	456,795
Treasury stock		(145,023)	(88,336)
Accumulated other comprehensive loss		18	(2,178)
Accumulated deficit		(337,860)	(222,735)
Total shareholders' equity		40,120	143,546	$ 152,805	$ 143,290
Total liabilities and shareholders' equity		96,097	201,807
Short-term marketable securities			4,781
Long-term investments			2,000
Accounts payable		9,333	8,312
Accrued compensation and related benefits		4,048	5,518
Accrued liabilities		9,867	8,845
Inventory		11,026	8,684
Prepaid expenses and other current assets		1,127	1,139
Software, equipment and leasehold improvements, net		1,839	7,265
Intangible assets, net		2,079	2,439
LIABILITIES
Accrued liabilities		4,812	4,762
Other long-term liabilities		16	7
Z Wave and Media Connectivity [Member]
Cash and cash equivalents		2,000	2,000
Restricted cash		335	303
Accounts receivable, net		7,405	15,874
Inventory		11,026	8,684
Prepaid expenses and other current assets		1,127	1,139
Software, equipment and leasehold improvements, net		1,839	7,265
Intangible assets, net		2,079	2,439
Deferred tax assets		777	658
Other non-current assets		8	8
Total assets held for sale		26,596	38,370
LIABILITIES
Accounts payable		6,531	5,918
Accrued compensation and related benefits		2,464	2,609
Accrued liabilities		4,812	4,762
Income taxes payable		4,128	1,635
Other long-term liabilities		16	7
Total liabilities held for sale		17,951	14,931
Scenario - Before Adjustments [Member]
Cash and cash equivalents		40,628	66,425
Restricted cash		335	303
Accounts receivable, net of allowance for doubtful accounts of $2,022 as of February 3, 2018 and $1,630 as of January 28, 2017		17,120	35,860
Inventory		14,064	18,147
Prepaid expenses and other current assets		7,898	8,017
Current assets held for sale
Total current assets		80,045	133,533
Software, equipment and leasehold improvements, net		6,178	18,523
Intangible assets, net		4,630	30,744
Goodwill			10,594
Deferred tax assets		770	625
Non-current assets held for sale
Other non-current assets		4,467	5,755
Total assets		96,090	201,774
Accounts payable		15,864	14,230
Accrued compensation and related benefits		6,512	8,127
Accrued liabilities		14,679	13,607
Current liabilities held for sale
Total current liabilities		37,055	35,964
Income taxes payable		15,708	15,752
Deferred tax liabilities		38	287
Long-term liabilities held for sale
Other long-term liabilities		3,169	6,225
Total liabilities		55,970	58,228
Common stock and additional paid-in capital		522,985	513,168
Treasury stock		(88,336)	(88,336)
Accumulated other comprehensive loss		18	(2,178)
Accumulated deficit		(394,547)	(279,108)
Total shareholders' equity		40,120	143,546
Total liabilities and shareholders' equity		96,090	201,774
Short-term marketable securities			4,781
Long-term investments			2,000
Accounts payable		15,864	14,230
Accrued compensation and related benefits		6,512	8,127
Accrued liabilities		14,679	13,607
Pro Forma - Assets Held for Sale [Member]
Cash and cash equivalents, adjustments		(2,000)	(2,000)
Restricted cash, adjustments		(335)	(303)
Accounts receivable, net, adjustments		(7,405)	(15,874)
Inventory, adjustments		(11,026)	(8,684)
Prepaid expenses and other current assets, adjustments		(1,127)	(1,139)
Current assets held for sale, adjustments
Total current assets, adjustments		(21,893)	(28,000)
Software, equipment and leasehold improvements, net, adjustments		(1,839)	(7,265)
Intangible assets, net, adjustments		(2,079)	(2,439)
Goodwill, adjustments
Deferred tax assets, adjustments		(777)	(658)
Non-current assets held for sale, adjustments
Other non-current assets, adjustments		(8)	(8)
Total assets, adjustments		(26,596)	(38,370)
Accounts payable, adjustments		(6,531)	(5,918)
Accrued compensation and related benefits, adjustments		(2,464)	(2,609)
Accrued liabilities, adjustments		(4,812)	(4,762)
Current liabilities held for sale, adjustments
Total current liabilities, adjustments		(13,807)	(13,289)
Income taxes payable, adjustments		(4,128)	(1,635)
Deferred tax liabilities, adjustments
Long-term liabilities held for sale, adjustments
Other long-term liabilities, adjustments		(16)	(7)
Total liabilities, adjustments		(17,951)	(14,931)
Common stock and additional paid-in capital, adjustments			(56,373)
Treasury stock, adjustments		(56,687)
Accumulated other comprehensive loss, adjustments
Accumulated deficit, adjustments		48,042	32,934
Total shareholders' equity, adjustments		(8,645)	(23,439)
Total liabilities and shareholders' equity, adjustments		(26,596)	(38,370)
Short-term marketable securities, adjustments
Long-term investments, adjustments
Accounts payable, adjustments		(6,531)	(5,918)
Accrued compensation and related benefits, adjustments		(2,464)	(2,609)
Accrued liabilities, adjustments		(4,812)	(4,762)
Pro Forma - Other Adjustments [Member]
Cash and cash equivalents, adjustments
Restricted cash, adjustments
Accounts receivable, net, adjustments
Inventory, adjustments
Prepaid expenses and other current assets, adjustments
Current assets held for sale, adjustments		21,893	28,000
Total current assets, adjustments		21,893	28,000
Software, equipment and leasehold improvements, net, adjustments
Intangible assets, net, adjustments
Goodwill, adjustments
Deferred tax assets, adjustments	[1]	7	33
Non-current assets held for sale, adjustments		4,703	10,370
Other non-current assets, adjustments
Total assets, adjustments		26,603	38,403
Accounts payable, adjustments
Accrued compensation and related benefits, adjustments
Accrued liabilities, adjustments
Current liabilities held for sale, adjustments		13,807	13,289
Total current liabilities, adjustments		13,807	13,289
Income taxes payable, adjustments
Deferred tax liabilities, adjustments	[1]	7	33
Long-term liabilities held for sale, adjustments		4,144	1,642
Other long-term liabilities, adjustments
Total liabilities, adjustments		17,958	14,964
Common stock and additional paid-in capital, adjustments
Treasury stock, adjustments
Accumulated other comprehensive loss, adjustments
Accumulated deficit, adjustments		8,645	23,439
Total shareholders' equity, adjustments		8,645	23,439
Total liabilities and shareholders' equity, adjustments		26,603	38,403
Short-term marketable securities, adjustments
Long-term investments, adjustments
Accounts payable, adjustments
Accrued compensation and related benefits, adjustments
Accrued liabilities, adjustments

[1] Reclassification of a negative Deferred tax asset to Deferred tax liability.