Note 8 Pension Plans (Net Amount Recognized) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2011
Change in Projected Benefit Obligation
Projected Benefit Obligation at the Beginning of the Year	$ 37,872	$ 37,530
Service Cost	96	84	71
Interest Cost	1,890	2,049	2,065
Actuarial Loss	4,984	833
Benefits Paid	(1,675)	(2,054)
Foreign Currency Adjustment	(1,708)	(570)
Projected Benefit Obligation at Year End	41,459	37,872	37,530
Change in Plan Assets
Fair Value of Plan Assets at the Beginning of the Year	22,871	23,315
Actual Return on Plan Assets	3,733	430
Employer Contribution	902	759
Benefits Paid from Assets	(1,305)	(1,589)
Foreign Currency Adjustment	(1,072)	(44)
Plan Assets at Fair Value at Year End	25,129	22,871	23,315
Underfunded Status of the Plan at Year End	(16,330)	(15,001)
Pension Liability Recognized on the Balance Sheet Due after One Year	16,330	15,001
Plans with Projected Benefit Obligation and Accumulated Benefit Obligation in Excess of Plan Assets:
Projected Benefit Obligation at Year End	41,459	37,872
Accumulated Benefit Obligation at Year End	40,696	37,235
Plan Assets at Fair Value at Year End	25,129	22,871
Amounts Recognized in Accumulated Other Comprehensive Income (Loss):
Unrecognized Actuarial Loss, Gross of Tax	(8,076)	(5,837)
Amount Recognized as Component of Stockholders Equity (Pretax)	(8,076)	(5,837)
Accumulated Benefit Obligation at Year End	$ 40,696	$ 37,235