|
Notes Payable and Credit Arrangements Line of Credit Period Balances (Details) (USD $)
|
Sep. 30, 2014
|
Dec. 31, 2013
|
Sep. 18, 2013
|
| Line of Credit Facility [Line Items] |
|
|
|
| Line of credit facility, amount outstanding |
$ 0 |
$ 583,000 |
|
| Line of credit facility, remaining borrowing capacity |
669,000 |
|
|
| Letters of credit outstanding, amount |
188,000 |
170,000 |
|
|
Spire Corporation | Revolving Credit Facility
|
|
|
|
| Line of Credit Facility [Line Items] |
|
|
|
| Line of credit facility, amount outstanding |
0 |
107,000 |
|
|
Spire Corporation | Ex-Im Facility
|
|
|
|
| Line of Credit Facility [Line Items] |
|
|
|
| Line of credit facility, amount outstanding |
0 |
38,000 |
|
|
N2 Biomedical LLC
|
|
|
|
| Line of Credit Facility [Line Items] |
|
|
|
| Line of credit facility, amount outstanding |
0 |
438,000 |
|
| Long-term debt |
5,300,000 |
5,800,000 |
6,000,000 |
| Debt instrument, interest rate at period end |
4.50% |
|
|
|
N2 Biomedical LLC | Revolving Credit Facility
|
|
|
|
| Line of Credit Facility [Line Items] |
|
|
|
| Line of credit facility, amount outstanding |
$ 0 |
$ 438,000 |
|
| Line of credit facility, interest rate at period end |
3.75% |
|
|