Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Revenues:
Diagnostic Services	$ 42,170	$ 37,171	$ 36,064
Diagnostic Imaging	13,438	12,205	14,449
Total revenues	55,608	49,376	50,513
Cost of revenues:
Diagnostic Services	31,721	27,828	27,293
Diagnostic Imaging	7,247	7,432	10,128
Total cost of revenues	38,968	35,260	37,421
Gross profit	16,640	14,116	13,092
Operating expenses:
Research and development	0	1,025	3,716
Marketing and sales	4,730	4,411	6,402
General and administrative	8,344	8,118	7,839
Amortization of intangible assets	356	231	233
Restructuring charges	692	1,728	0
Gain on sale of assets and license agreement	0	(1,568)	0
Total operating expenses	14,122	13,945	18,190
Income (loss) from operations	2,518	171	(5,098)
Other income (expense):
Interest and other income, net	58	63	101
Interest expense	(39)	(15)	(4)
Total other income	19	48	97
Income (loss) before income taxes	2,537	219	(5,001)
Income tax benefit (expense)	(62)	45	77
Net income (loss)	2,475	264	(4,924)
Net income (loss) per share:
Earnings Per Share, Basic (in dollars per share)	$ 0.13	$ 0.01	$ (0.26)
Earnings Per Share, Diluted (in dollars per share)	$ 0.13	$ 0.01	$ (0.26)
Shares used in per share computations:
Weighted average shares outstanding - basic (in dollars per share)	18,571	18,789	19,274
Weighted average shares outstanding - diluted (in dollars per share)	18,878	19,159	19,274
Common stock dividends declared (usd per share)	$ 0.20	$ 0.05	$ 0.00
Other Comprehensive loss:
Unrealized loss on marketable securities	(17)	(19)	(16)
Total other comprehensive loss	(17)	(19)	(16)
Comprehensive loss	2,458	245	(4,940)
Accumulated Other Comprehensive Income (Loss) [Member]
Other Comprehensive loss:
Unrealized loss on marketable securities	$ (17)	$ (19)	$ (16)