Note 9 Borrowing Arrangements (Narratives) (Details)	3 Months Ended				3 Months Ended
	Jun. 30, 2013 IKB Deutshe Industriebank Loan Payable [Member] USD ($)	Jun. 30, 2013 IKB Deutshe Industriebank Loan Payable [Member] EUR (€)	Jun. 30, 2013 Minimum [Member] IKB Deutshe Industriebank Loan Payable [Member]	Jun. 30, 2013 Maximum [Member] IKB Deutshe Industriebank Loan Payable [Member]	Jun. 30, 2013 Bank of West Original Arrangement November 13 2009 [Member] USD ($)	Jun. 30, 2013 Bank of West Extended Arrangement December 29 2010 [Member] USD ($)	Jun. 30, 2013 Bank of West [Member] USD ($)	Jun. 30, 2013 Bank of West [Member] Minimum [Member]	Jun. 30, 2013 Bank of West [Member] Maximum [Member]
Line of Credit Facility [Line Items]
Line of Credit Facility, Initiation Date					Nov. 13, 2009	Dec. 29, 2010	Dec. 29, 2010
Line of Credit Facility, Expiration Date					Oct. 31, 2011	Oct. 31, 2013	Oct. 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 Facility, Basis Spread on Variable Rate								1.50%	3.25%
Debt Instrument, Interest Rate at Period End							2.78%
Available Credit Line for Letter of Credit							3,000,000
Debt Instrument [Line Items]
Debt Instrument, Face Amount	12,200,000	10,000,000
Debt Instrument, Issuance Date	Jun. 10, 2005	Jun. 10, 2005
Debt Instrument, Maturity Date	Jun. 30, 2020	Jun. 30, 2020
Debt Instrument, Payment Terms	each fiscal quarter	each fiscal quarter
Debt Instrument, Description of Variable Rate Basis	three month Euribor rate	three month Euribor rate
Debt Instrument, Basis Spread on Variable Rate			0.70%	1.25%
Debt Instrument, Periodic Payment, Principal	217,000	167,000
Long-term Debt, Gross	$ 6,100,000	€ 4,700,000
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%