|
INVESTMENTS: Short Term Investments (Details) (USD $)
In Thousands, unless otherwise specified
|
3 Months Ended |
6 Months Ended |
|
|
May 31, 2013
|
May 31, 2012
|
May 31, 2013
|
May 31, 2012
|
Nov. 30, 2012
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Short-term investments, Cost Basis |
$ 13,989 |
|
$ 13,989 |
|
$ 15,816 |
| Gross unrealized gain (loss) on investments |
553 |
|
553 |
|
117 |
| Short-term investments, Carrying Value |
14,542 |
|
14,542 |
|
15,933 |
| Gain (Loss) on Trading Securities [Abstract] |
|
|
|
|
|
| Gain (loss) on trading investments |
671 |
25 |
1,240 |
1,114 |
|
|
Trading securities [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Short-term investments, Cost Basis |
3,688 |
|
3,688 |
|
5,636 |
| Gross unrealized gain (loss) on investments |
508 |
|
508 |
|
73 |
| Short-term investments, Carrying Value |
4,196 |
|
4,196 |
|
5,709 |
|
Available-for-sale securities [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Short-term investments, Cost Basis |
0 |
|
0 |
|
0 |
| available-for-sale Securities, Gross Unrealized Gain (Loss) company |
45 |
|
45 |
|
44 |
| Short-term investments, Carrying Value |
45 |
|
45 |
|
44 |
|
Held-to-maturity securities [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Short-term investments, Cost Basis |
8,557 |
|
8,557 |
|
8,297 |
| Gross unrealized gain (loss) on investments |
0 |
|
0 |
|
0 |
| Short-term investments, Carrying Value |
8,557 |
|
8,557 |
|
8,297 |
|
Cost-method investments [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Short-term investments, Cost Basis |
1,744 |
|
1,744 |
|
1,883 |
| Gross unrealized gain (loss) on investments |
0 |
|
0 |
|
0 |
| Short-term investments, Carrying Value |
$ 1,744 |
|
$ 1,744 |
|
$ 1,883 |
|
Minimum [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Held-to-maturity Securities, Debt Maturity Period |
|
|
3 months |
|
|
|
Maximum [Member]
|
|
|
|
|
|
| Marketable Securities, Current [Abstract] |
|
|
|
|
|
| Held-to-maturity Securities, Debt Maturity Period |
|
|
1 year |
|
|