Supplementary Balance Sheet Information (Details) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Inventories, net:
Raw Materials	$ 2,741	$ 2,899
Work-in-process	2,208	2,665
Finished Goods	2,713	2,207
Inventory, Gross	7,662	7,771
Less reserve for excess and obsolete inventories	(1,415)	(1,593)
Inventory, Net	6,247	6,178
Property and equipment, net:
Machinery and equipment	22,046	21,684
Computer hardware and software	2,774	2,712
Leasehold Improvements	828	813
Property, Plant and Equipment, Gross	25,648	25,209
Accumulated depreciation	(20,617)	(19,842)
Property, Plant and Equipment, Net	5,031	5,367
Intangible assets, net:
Customer relationships	2,600	2,600
Covenants not to compete	300	300
Patents	141	141
Intangible Assets, Gross	3,041	3,041
Accumulated amortization of customer relationships	(2,311)	(2,201)
Accumulated amortization of covenants not to compete	(300)	(280)
Accumulated amortization of patents	(89)	(83)
Intangible Assets, Net	341	477
Other accrued liabilities:
Sales and property taxes payable	459	473
Radiopharmaceuticals and consumable medical supplies	516	243
Professional fees	406	293
Outside services and consulting	251	836
Facilities and related costs	146	129
Travel expenses	100	110
Other accrued liabilities	495	313
Total other accrued liabilities	$ 2,373	$ 2,397