Note 10. Stock-Based Awards (Details) - Outstanding and Exercisable Stock Options (USD $)	12 Months Ended
	Mar. 31, 2013
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Number of Shares (in Shares)	5,780,608
Weighted Average Remaining Contractual Life	6 years 215 days
Weighted Average Exercise Price	$ 2.09
Number of Shares Exercisable (in Shares)	3,580,173
Exercisable Options Weighted Average Exercise Price	$ 2.34
Range 1 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Exercise Price Limit	$ 0.79
Upper Exercise Price Limit	$ 1.16
Number of Shares (in Shares)	700,250
Weighted Average Remaining Contractual Life	7 years 105 days
Weighted Average Exercise Price	$ 1.00
Number of Shares Exercisable (in Shares)	460,625
Exercisable Options Weighted Average Exercise Price	$ 0.99
Range 2 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Exercise Price Limit	$ 1.17
Upper Exercise Price Limit	$ 2.32
Number of Shares (in Shares)	3,554,833
Weighted Average Remaining Contractual Life	7 years 284 days
Weighted Average Exercise Price	$ 1.69
Number of Shares Exercisable (in Shares)	1,734,208
Exercisable Options Weighted Average Exercise Price	$ 1.69
Range 3 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Exercise Price Limit	$ 2.33
Upper Exercise Price Limit	$ 3.48
Number of Shares (in Shares)	471,650
Weighted Average Remaining Contractual Life	7 years 211 days
Weighted Average Exercise Price	$ 2.63
Number of Shares Exercisable (in Shares)	331,465
Exercisable Options Weighted Average Exercise Price	$ 2.67
Range 4 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Exercise Price Limit	$ 3.49
Upper Exercise Price Limit	$ 4.65
Number of Shares (in Shares)	893,375
Weighted Average Remaining Contractual Life	1 year 7 days
Weighted Average Exercise Price	$ 3.72
Number of Shares Exercisable (in Shares)	893,375
Exercisable Options Weighted Average Exercise Price	$ 3.72
Range 5 [Member]
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]
Lower Exercise Price Limit	$ 4.66
Upper Exercise Price Limit	$ 5.81
Number of Shares (in Shares)	160,500
Weighted Average Remaining Contractual Life	5 years 58 days
Weighted Average Exercise Price	$ 4.88
Number of Shares Exercisable (in Shares)	160,500
Exercisable Options Weighted Average Exercise Price	$ 4.88