Quarterly Financial Data (Unaudited) (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012
Quarterly Financial Data (Unaudited)
Revenues	$ 17,623	$ 16,548	$ 17,027	$ 17,030	$ 15,883	$ 13,994	$ 15,504	$ 16,304	$ 68,228	$ 61,685	$ 58,406
Gross Profit (in dollars)	6,144	6,192	6,912	6,726	5,772	5,151	6,071	6,264	25,974	23,258	23,071
Net Income	$ 50	$ 238	$ 661	$ 460	$ 56	$ 1,097	$ 550	$ 676	$ 1,409	$ 2,379	$ 2,514
Basic Net Income per Share (in dollars per share)	$ 0.00	$ 0.01	$ 0.02	$ 0.01	$ 0.00	$ 0.03	$ 0.02	$ 0.02	$ 0.04	$ 0.07
Diluted Net Income per Share (in dollars per share)	$ 0.00	$ 0.01	$ 0.02	$ 0.01	$ 0.00	$ 0.03	$ 0.02	$ 0.02	$ 0.04	$ 0.07