Note 10 - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Depreciation of property and equipment	$ 580	$ 596
Intangibles	279	224
Net operating loss ("NOL") (state and foreign)	264	513
Inventories	186	184
Accrued vacation pay and stock-based compensation	$ 151	126
Tax credit carryforwards (foreign, research and AMT)		92
Allowance for doubtful accounts	$ 55	56
Acquisition costs	31	34
Accrued warranty	5	6
Other	13	21
Total	1,564	1,852
Valuation allowance	(15)	(100)
Deferred tax assets	1,549	1,752
Net intangible assets	(222)	(232)
Unremitted earnings of foreign subsidiaries	(82)	(107)
Deferred tax liabilities	(304)	(339)
Net deferred tax asset	$ 1,245	$ 1,413