Income Taxes (Narrative) (Details) - USD ($)	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Operating Loss Carryforwards [Line Items]
Excess tax benefits from stock-based compensation	$ 0	$ 0	$ 0
Valuation allowance	30,078,000
Increase in valuation allowance	4,627,000	5,740,000
Unrecognized tax benefits	$ 113,000	$ 227,000	$ 212,000	$ 210,000
Minimum
Operating Loss Carryforwards [Line Items]
Examination period for state income tax returns	3 years
Maximum
Operating Loss Carryforwards [Line Items]
Examination period for state income tax returns	5 years
Domestic Country
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 65,746,000
Exercise of NQSOs	2,977,000
Tax credit carryforwards	1,403,000
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	56,231,000
Exercise of NQSOs	3,324,000
Tax credit carryforwards	724,000
State and Local Jurisdiction | Wisconsin Department of Revenue
Operating Loss Carryforwards [Line Items]
Income tax settlement	$ 460,000