Financing arrangements (Details) | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 | Mar. 31, 2014 |
Interest rate swap | Revolving Credit Facility [Member] | Loans Payable [Member] | Notes Payable, Other Payables [Member] | Notes Payable, Other Payables [Member] | Domestic Credit Facility [Member] | Domestic Credit Facility [Member] | Revolving Credit Facility [Member] | Commercial bank in the Netherlands [Member] | Commercial bank in the Netherlands [Member] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Commercial bank in Belgium [Member] [Domain] | Prime Rate [Member] | LIBOR [Member] | LIBOR [Member] | Minimum [Member] | Minimum [Member] | Maximum [Member] | Maximum [Member] |
| | USD ($) | USD ($) | EUR (€) | Revolving Credit Facility [Member] | Credit sub-facility standby letters of credit [Member] | Credit sub-facility standby letters of credit [Member] | Credit sub-facility standby letters of credit [Member] | Credit sub-facility standby letters of credit [Member] | USD ($) | EUR (€) | Line of Credit [Member] | Line of Credit [Member] | Outstanding performance guarantees [Member] | Outstanding performance guarantees [Member] | Commercial Loan [Member] | Commercial Loan [Member] | Domestic Credit Facility [Member] | Revolving credit facility term loan [Member] | Domestic Credit Facility [Member] | Prime Rate [Member] | LIBOR [Member] | Prime Rate [Member] | LIBOR [Member] |
| | | | | USD ($) | USD ($) | USD ($) | USD ($) | EUR (€) | | | USD ($) | EUR (€) | USD ($) | EUR (€) | USD ($) | EUR (€) | Revolving Credit Facility [Member] | | Revolving Credit Facility [Member] | Commercial bank in Belgium [Member] [Domain] | Domestic Credit Facility [Member] | Commercial bank in Belgium [Member] [Domain] | Domestic Credit Facility [Member] |
| | | | | | | | | | | | | | | | | | | | | Line of Credit [Member] | Revolving Credit Facility [Member] | Line of Credit [Member] | Revolving Credit Facility [Member] |
Line of Credit Facility [Line Items] | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Maximum borrowing capacity | ' | ' | ' | ' | ' | ' | $15,000,000 | $6,000,000 | ' | $4,119,600 | € 3,000,000 | $3,700,000 | € 2,700,000 | $1,099,000 | € 800,000 | $687,000 | € 500,000 | $1,900,000 | € 1,400,000 | ' | ' | ' | ' | ' | ' | ' |
Line of Credit Facility, Interest Rate During Period | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 2.91% | ' | 3.98% | ' |
Maturity date | ' | ' | 30-Sep-14 | 2-Jan-24 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Interest rate (in hundredths) | ' | ' | ' | ' | ' | ' | 1.65% | ' | ' | ' | ' | ' | ' | 9.75% | 9.75% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Outstanding at the end of the period | ' | ' | ' | ' | ' | ' | ' | 1,049,000 | 0 | ' | ' | ' | ' | 1,300,000 | 900,000 | 26,000 | 19,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Debt Instrument, Description of Variable Rate Basis | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 'prime | ' | 'BBA LIBOR | ' | ' | ' | ' |
Debt Instrument, Basis Spread on Variable Rate | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | 0.25% | 1.40% | ' | 1.25% | 1.50% | ' | 1.75% |
Term on debt | ' | ' | ' | '15 years | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Loan amount | ' | ' | ' | 6,400,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Long-term Debt, Gross | ' | ' | ' | $4,600,000 | $160,000 | € 117,000 | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Debt Instrument, Interest Rate, Stated Percentage | 4.99% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |
Fixed interest rate (in hundredths) | ' | 4.27% | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' | ' |