Financing arrangements (Details) | Jul. 20, 2015 | Jun. 30, 2016USD ($) | Jun. 30, 2015USD ($) | Jun. 30, 2016EUR (€) | Sep. 30, 2015USD ($) |
Line of Credit Facility [Line Items] | | | | | |
Line of credit, current | | $ 1,000,000 | | | $ 0 |
Line of Credit | Loans Payable | Interest rate swap | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Fixed interest rate (in hundredths) | | | 6.20% | | |
Domestic Credit Facility | Line of Credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Letters of credit outstanding, amount | | 900,000 | | | |
Domestic Credit Facility | Line of Credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | | $ 20,300,000 | | |
Domestic Credit Facility | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | | $ 15,000,000 | | |
Line of credit, current | | 1,000,000 | | | |
Line of Credit Facility, Interest Rate at Period End | | | 4.75% | | |
Domestic Credit Facility | Line of Credit | Credit sub-facility standby letters of credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | | $ 4,000,000 | | |
Domestic Credit Facility | Line of Credit | Loans Payable | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | | $ 5,300,000 | | |
Term of loan | 3 years | | | | |
Commercial bank in Belgium | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | 3,000,000 | | € 2,700,000 | |
Commercial bank in Belgium | Line of Credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | $ 885,440 | | € 800,000 | |
Line of Credit Facility, Interest Rate at Period End | | 9.75% | | 9.75% | |
Outstanding at the end of the period | | $ 335,000 | | € 303,000 | |
Commercial bank in Belgium | Outstanding performance guarantees | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | 553,400 | | 500,000 | |
Outstanding at the end of the period | € | | | | 0 | |
Commercial bank in Belgium | Commercial Loan | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Maximum borrowing capacity | | $ 1,500,000 | | € 1,400,000 | |
Base Rate | Line of Credit | Loans Payable | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 1.75% | | |
LIBOR | Line of Credit | Loans Payable | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 3.25% | | |
Prime Rate | Minimum | Commercial bank in Belgium | Line of Credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | 1.25% | | | |
Interest rate during period | | 2.91% | | | |
Prime Rate | Maximum | Commercial bank in Belgium | Line of Credit | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Interest rate during period | | 3.98% | | | |
Tier One | Base Rate | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 0.75% | | |
Tier One | LIBOR | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 2.25% | | |
Tier Two | Base Rate | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 1.00% | | |
Tier Two | LIBOR | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 2.50% | | |
Tier Three | Base Rate | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 1.25% | | |
Tier Three | LIBOR | Line of Credit | Revolving Credit Facility | | | | | |
Line of Credit Facility [Line Items] | | | | | |
Basis spread on variable rate | | | 2.75% | | |