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Note 1 - Business Description, Basis of Presentation and Significant Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2017

Notes Tables

Schedule of Accounts, Notes, Loans and Financing Receivable [Table Text Block]

		Year Ended December 31,
		2017				2016				201 5
Balance at beginning of the year		$	187			$	54			$	58
Allowance increase (decrease)			287				148				36
Write offs , net of recoveries			(2	)			(15	)			(40	)
Balance at end of the year		$	472			$	187			$	54

Schedule of Deferred Revenue and Associated Cost of Goods Sold and Gross Profit [Table Text Block]

		As of December 31,
		2017				2016
Deferred revenue		$	4,635			$	3,882
Deferred cost of goods sold			1,555				1,530
Deferred gross profit		$	3,080			$	2,352

Schedule of Product Warranty Liability [Table Text Block]

		Year Ended December 31,
		2017				2016				201 5
Balance at the beginning of year		$	246			$	288			$	331
Accruals/additions			399				361				442
Usage/claims			(400	)			(403	)			(485	)
Balance at end of year		$	245			$	246			$	288

Schedule of Earnings Per Share, Basic and Diluted [Table Text Block]

		Year Ended December 31,
		2017				2016				201 5
Numerator:
Net income/(loss)		$	(14,172	)		$	2,444			$	6,776
Denominator:
Basic weighted average shares			8,576,588				9,021,980				9,127,385
Dilutive common stock equivalents using treasury stock method			-				284,054				467,274
Diluted weighted average shares			8,576,588				9,306,034				9,594,659
Basic earnings per common share:		$	(1.65	)		$	0.27			$	0.74
Diluted earnings per common share:		$	(1.65	)		$	0.26			$	0.71
Weighted average options outstanding			815,870				885,163				1,053,785
Anti-dilutive options not included in the computation			815,870				323,644				177,125

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.3,4)
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-Publisher FASB
-Name Accounting Standards Codification
-Topic 260
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