Business Combinations and Asset Acquisitions (Details) (USD $)	3 Months Ended		9 Months Ended		12 Months Ended		0 Months Ended		12 Months Ended			0 Months Ended	12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012 Shepherd Scientific, Inc. [Member]	Dec. 21, 2012 Shepherd Scientific, Inc. [Member]	Apr. 17, 2013 St. Jude Medical, Cardiology Division, Inc. [Member]	Aug. 16, 2012 St. Jude Medical, Cardiology Division, Inc. [Member]	Dec. 31, 2012 St. Jude Medical, Cardiology Division, Inc. [Member]	Dec. 31, 2012 Accumed Systems, Inc. [Member]	Jun. 11, 2012 Accumed Systems, Inc. [Member]	Jan. 06, 2012 Dr. Pedro Silva and Affiliates [Member]	Dec. 31, 2012 Dr. Pedro Silva and Affiliates [Member]
Purchase price allocation [Abstract]
Business acquisition, cost of acquired entity, purchase price, total						$ 500,000		$ 3,000,000			$ 1,500,000
Business acquisition, cost of acquired entity, cash paid			500,000	7,000,000			750,000	2,250,000
Business acquisition, purchase price allocation, liabilities assumed						0		0			0
Acquired indefinite-lived intangible asset, amount												3,250,000
Purchase price asset allocation [Abstract]
Inventory and equipment						70,000		189,000			8,000
Purchased technology						170,000		850,000			740,000
Other intangibles						50,000		500,000			190,000
Goodwill						210,000		1,461,000			562,000
Total asset purchase price allocation						500,000		3,000,000			1,500,000
Estimated useful life of purchased technology and other intangible assets, minimum					9 years				9 years	9 years
Estimated useful life of purchased technology and other intangible assets, maximum					10 years				10 years	10 years
Estimated useful life of purchased technology and other intangible assets													10 years
Business acquisition, pro forma information [Abstract]
Revenue	28,009,000	24,625,000	81,427,000	73,739,000
Net earnings	$ 2,672,000	$ 2,540,000	$ 7,605,000	$ 6,754,000
Net earnings per share [Abstract]
Basic (in dollar per share)	$ 0.16	$ 0.16	$ 0.47	$ 0.42
Diluted (in dollar per share)	$ 0.16	$ 0.15	$ 0.45	$ 0.41