Annual report pursuant to Section 13 and 15(d)

Income Taxes (Details 1)

Income Taxes (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Deferred Tax Liability Not Recognized [Line Items]
Deferred Tax Assets, Tax Deferred Expense	$ 2,735				$ 32,599				$ 2,735	$ 32,599
Deferred Tax Liabilities, Net	(306)				(282)				(306)	(282)
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Allowance for Doubtful Accounts	4				3				4	3
Deferred Tax Assets, Tax Credit Carryforwards, Alternative Minimum Tax	697				697				697	697
Deferred Tax Assets, Tax Credit Carryforwards, Foreign	674				718				674	718
Deferred Tax Assets, Tax Credit Carryforwards, Research	2,735				3,451				2,735	3,451
Deferred Tax Liabilities, Property, Plant and Equipment	1,224				1,286				1,224	1,286
Deferred Tax Assets, Tax Deferred Expense, Compensation and Benefits, Employee Compensation	1,326				1,186				1,326	1,186
Deferred Tax Assets, Inventory	888				575				888	575
Deferred Tax Assets, Tax Deferred Expense, Reserves and Accruals, Warranty Reserves	57				90				57	90
Deferred Tax Assets, Operating Loss Carryforwards	29,315				25,874				29,315	25,874
Deferred Tax Liabilities, Intangible Assets	689				172				689	172
Deferred Tax Assets, Other	1,105				518				1,105	518
Deferred Tax Assets, Gross	38,714				34,570				38,714	34,570
Deferred Tax Assets, Valuation Allowance	(36,285)				(2,253)				(36,285)	(2,253)	1,700
Deferred Tax Assets, Net	2,429				32,317				2,429	32,317
Effective Income Tax Rate, Continuing Operations									(208.40%)	39.90%	(543.00%)
Income Tax Expense (Benefit)	32,823	(1,399)	(1,059)	(973)	1,725	(268)	(1,810)	13,228	29,392	12,875	(53,304)
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate									34.00%	35.00%	35.00%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Meals and Entertainment									(0.20%)	0.10%	0.30%
Effective Income Tax Rate Reconciliation, State and Local Income Taxes									3.10%	3.10%	4.00%
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance									(241.30%)	5.30%	(591.70%)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Impairment Losses									(1.90%)	0.00%	0.00%
effective income tax rate reconciliation change in deferred taxes									0.50%	2.60%	14.70%
Effective Income Tax Rate Reconciliation, Tax Contingencies									0.00%	(6.30%)	(4.00%)
Effective Income Tax Rate Reconciliation, Other Adjustments									(2.60%)	0.10%	(1.30%)
Domestic Tax Authority [Member]
Deferred Tax Liability Not Recognized [Line Items]
Current Federal Tax Expense (Benefit)									0	(775)	685
Deferred Federal Income Tax Expense (Benefit)									24,578	9,604	(53,606)
Income Tax Expense (Benefit)									24,578	8,829	(52,921)
State and Local Jurisdiction [Member]
Deferred Tax Liability Not Recognized [Line Items]
Current State and Local Tax Expense (Benefit)									2	1,219	(130)
Deferred State and Local Income Tax Expense (Benefit)									4,797	2,770	(288)
Income Tax Expense (Benefit)									4,799	3,989	(418)
Foreign Tax Authority [Member]
Deferred Tax Liability Not Recognized [Line Items]
Current Foreign Tax Expense (Benefit)									(8)	50	71
Deferred Foreign Income Tax Expense (Benefit)									23	7	(36)
Income Tax Expense (Benefit)									$ 15	$ 57	$ 35