Note 8 Borrowing Arrangements (narratives) (Details)	3 Months Ended
	Jun. 30, 2012 IKB Deutshe Industriebank Loan Payable [Member] USD ($)	Jun. 30, 2012 IKB Deutshe Industriebank Loan Payable [Member] EUR (€)	Jun. 30, 2012 Notes Payable, Other Payables [Member] USD ($) N	Jun. 30, 2012 Bank of West Original Arrangement November 13 2009 [Member] USD ($)	Jun. 30, 2012 Bank of West Extended Arrangement December 29 2010 [Member] USD ($)	Jun. 30, 2012 Bank of West [Member] USD ($)
Line of Credit Facility [Line Items]
Line of Credit Facility, Expiration Date				October 31, 2011	October 31, 2013	October 31, 2013
Line of Credit Facility, Amount Outstanding						$ 15,000,000
Line of Credit Facility, Maximum Borrowing Capacity				15,000,000	20,000,000	20,000,000
Line of Credit, Variable Rate Basis Spread						150 to 325 basis points
Debt Instrument, Interest Rate at Period End						2.97%
Available Credit Line for Letter of Credit						3,000,000
Debt Instrument [Line Items]
Debt Instrument, Face Amount	12,200,000	10,000,000	2,000,000
Debt Instrument, Issuance Date	June 10, 2005	June 10, 2005	September 10, 2008
Debt Instrument, Maturity Date	Jun. 20, 2020	Jun. 20, 2020
Debt Instrument, Number of Equal Monthly Installment			60
Debt Instrument, Frequency of Periodic Payment	each fiscal quarter	each fiscal quarter	monthly
Debt Instrument, Basis for Effective Rate	three month Euribor rate	three month Euribor rate
Debt Instrument, Variable Rate Basis Spread	70 to 125 basis points	70 to 125 basis points
Debt Instrument, Interest Rate, Stated Percentage			6.00%
Debt Instrument, Periodic Payment, Principal	210,000	167,000
Debt Instrument, Periodic Payment			38,666
Long-term Debt, Gross	$ 6,700,000	€ 5,300,000
Derivative, Inception Date	Jun. 30, 2010	Jun. 30, 2010
Derivative, Maturity Date	Jun. 30, 2015	Jun. 30, 2015
Derivative, Swaption Interest Rate	1.99%	1.99%
Debt Instrument, Payoff Date			April 2012