Stock-based Compensation - Options outstanding (Details) (USD $)	Jun. 30, 2013	Mar. 31, 2013
Aggregate Intrinsic Value
Options Outstanding, $5.98 - 6.29
Range of Exercise Prices, low	$ 5.98
Range of Exercise Prices, high	$ 6.29
Number of Options	75,000
Weighted Average Exercise Price Per Share	$ 6.11
Options Outstanding, $6.30 - 6.80
Range of Exercise Prices, low	$ 6.30
Range of Exercise Prices, high	$ 6.80
Number of Options	40,000
Weighted Average Exercise Price Per Share	$ 6.80
Options Outstanding, $5.98 - 6.80
Range of Exercise Prices, low	$ 5.98
Range of Exercise Prices, high	$ 6.80
Number of Options	115,000
Weighted Average Exercise Price Per Share	$ 6.35
Weighted Average Remaining Contract Life in Years	8 years 146 days
Aggregate Intrinsic Value