Summary of Significant Accounting Policies (Details) (USD $)	Dec. 31, 2012 State province	Dec. 31, 2012 Hospital	Dec. 31, 2011
Accounting Policies [Abstract]
Number Of Animal Hospitals Where Management Services Are Provided	47	177
Number Of States In Which Management Services Are Provided To Animal Hospitals	15	15
Deferred revenue and costs
Deferred equipment revenue		$ 735,000	$ 906,000
Deferred fixed priced support or maintenance contract revenue		3,383,000	2,890,000
Other deferred revenue		6,828,000	3,262,000
Total deferred revenue		10,946,000	7,058,000
Deferred Revenue, Current		10,811,000	7,025,000
Long-term portion of deferred revenue included in other liabilities		135,000	33,000
Current portion of deferred costs included in prepaid expenses and other		709,000	258,000
Long-term portion of deferred costs included in other assets		1,099,000	1,267,000
Total deferred costs		$ 1,808,000	$ 1,525,000