Note 3 - Acquisition (Details) - Allocation of the Purchase Price: (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012
Business Acquisition [Line Items]
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)
Total purchase price	3,802
Accrued Non-Compete/Non-Solicitation Payments [Member]
Tangible assets acquired and liabilities assumed:
Other Current Liabilities	(48)
Accrued Sales Commissions [Member]
Tangible assets acquired and liabilities assumed:
Other Current Liabilities	(82)
Accured Warranty [Member]
Tangible assets acquired and liabilities assumed:
Other Current Liabilities	$ (67)