Note 7. Stock-Based Awards (Detail) (USD $)	1 Months Ended	0 Months Ended	1 Months Ended	3 Months Ended		6 Months Ended
	Apr. 30, 2012	Aug. 15, 2003	Mar. 31, 2012	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011	Jul. 26, 2012	Aug. 15, 2007	Aug. 15, 2000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized		450,000						7,000,000	5,000,000	4,500,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures		10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross		10,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value (in Dollars per share)				$ 0.91	$ 1.60	$ 0.93	$ 1.70
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Intrinsic Value (in Dollars)				$ 341,000		$ 341,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value (in Dollars)				241,000		241,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value (in Dollars)				328,000		328,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Total Intrinsic Value (in Dollars)				21,000	77,000	23,000	281,000
Stock Issued During Period, Shares, Restricted Stock Award, Gross	48,656		144,808
Fair Value Inputs, Long-term Revenue Growth Rate			80.00%
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period			4 years
Unrecognized Stock Based Compensation Expense Related To Options (in Dollars)				2,500,000		2,500,000
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized (in Dollars)				$ 300,000		$ 300,000
Nonvested Restricted Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			306,606
Restricted Stock [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross	44,733		253,767
Management [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			286,606
2012 PIP [Member]
Stock Issued During Period, Shares, Restricted Stock Award, Gross			108,959
Target Incentive Opportunity [Member]
Fair Value Inputs, Long-term Revenue Growth Rate			75.00%
Individual Executive Performance Milestones [Member]
Fair Value Inputs, Long-term Revenue Growth Rate			25.00%