Note 3 - Acquisition (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Purchase Price Allocation [Table Text Block]

Goodwill	$	50
Identifable intangible assets		1,728
Tangible assets acquired and liabilities assumed:
Trade accounts receivable		1,161
Inventories		874
Property and equipment		263
Accounts payable		(77	)
Accrued non-compete/non-solicitation payments		(48	)
Accrued sales commissions		(82	)
Accrued warranty		(67	)
Total purchase price	$	3,802

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	December 31, 2012
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	1,480	$	439	$	1,041
Patented technology		590		233		357
Software		270		115		155
Trade name		140		33		107
Customer backlog		70		70		-
Non-compete/non-solicitation agreement		48		24		24
Total finite-lived intangible assets		2,598		914		1,684
Indefinite-lived intangible assets:
Sigma trademark		510		-		510
Total intangible assets	$	3,108	$	914	$	2,194

	December 31, 2011
	Gross Carrying Amount		Accumulated Amortization		Net Carrying Amount
Finite-lived intangible assets:
Customer relationships	$	370	$	200	$	170
Patented technology		230		150		80
Software		270		88		182
Total finite-lived intangible assets		870		438		432
Indefinite-lived intangible assets:
Sigma trademark		510		-		510
Total intangible assets	$	1,380	$	438	$	942

Business Acquisition, Pro Forma Information [Table Text Block]

	(Unaudited) Years Ended Dec. 31,
	2012		2011
Net revenues	$	43,592	$	52,742
Net earnings		2,156		8,530
Diluted earnings per share	$	0.21	$	0.83

Thermonics [Member]

Schedule of Finite-Lived Intangible Assets [Table Text Block]

	Fair Value		Weighted Average Estimated Useful Life
			(in months)
Customer relationships	$	1,110		72
Customer backlog		70		3
Thermonics trade name		140		48
Patented technology		360		132
Non-compete/non-solicitation agreement		48		18
Total intangible assets	$	1,728		78.3