Note 12 - Income Taxes (Details) - Deferred Tax Assets and Liabilities (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Deferred tax assets:
Net operating loss ("NOL") (state and foreign)	$ 829	$ 1,182
Depreciation of property and equipment	646	793
Tax credit carryforwards (foreign, research and AMT)	269	440
Inventories	180	177
Accrued vacation pay and stock-based compensation	169	182
Intangibles	162	86
Allowance for doubtful accounts	56	56
Acquisition costs	37	39
Accrued warranty	11	22
Other	26	68
	2,385	3,045
Valuation allowance	(287)	(573)	(484)
Deferred tax assets	2,098	2,472
Deferred tax liabilities:
Net intangible assets	(260)	(307)
Unremitted earnings of foreign subsidiaries	(107)	(127)
Deferred tax liabilities	(367)	(434)
Net deferred tax asset	$ 1,731	$ 2,038