Note 11 - Segment Information (Details) - Segment Reporting Information (USD $)	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Segment Reporting Information [Line Items]
Revenue	$ 31,009,000	$ 27,753,000	$ 89,969,000	$ 80,152,000
Operating income	547,000	390,000	1,454,000	903,000
Interest expense	44,000	28,000	128,000	80,000
Income tax expense	21,000	(139,000)	373,000	200,000
Net income from continuing operations	571,000	506,000	1,155,000	696,000
Depreciation and amortization	430,000	388,000	1,260,000	1,097,000
Capital expenditures	410,000	312,000	1,084,000	1,039,000
Other expense (income), net	(89,000)	(5,000)	(202,000)	(73,000)
Income before income tax expense	592,000	367,000	1,528,000	896,000
UNITED STATES
Segment Reporting Information [Line Items]
Revenue	11,666,000	11,327,000	35,265,000	32,390,000
Operating income	557,000	99,000	852,000	383,000
Interest expense	22,000	15,000	62,000	40,000
Income tax expense				(25,000)
Net income from continuing operations	442,000	225,000	697,000	377,000
Depreciation and amortization	321,000	307,000	964,000	858,000
Capital expenditures	252,000	224,000	765,000	855,000
Other expense (income), net	93,000	(141,000)	93,000	(9,000)
Income before income tax expense	535,000	84,000	790,000	368,000
International [Member]
Segment Reporting Information [Line Items]
Revenue	19,343,000	16,426,000	54,704,000	47,762,000
Operating income	(10,000)	291,000	602,000	520,000
Interest expense	22,000	13,000	66,000	40,000
Income tax expense	(72,000)	2,000	280,000	209,000
Net income from continuing operations	129,000	281,000	458,000	319,000
Depreciation and amortization	109,000	81,000	296,000	239,000
Capital expenditures	158,000	88,000	319,000	184,000
Other expense (income), net	(89,000)	(5,000)	(202,000)	(48,000)
Income before income tax expense	$ 57,000	$ 283,000	$ 738,000	$ 528,000