Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)
|
May 31, 2018 |
Nov. 30, 2017 |
| Trade accounts and notes receivable, allowance for doubtful accounts |
$ 17,109
|
$ 19,438
|
| Property, plant and equipment, accumulated depreciation |
154,662
|
154,762
|
| Definite lived intangible assets, accumulated amortization |
$ 123,540
|
$ 123,398
|
| Preferred shares, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Preferred shares, shares authorized (in shares) |
4,000,000
|
4,000,000
|
| Preferred shares, shares outstanding (in shares) |
0
|
0
|
| Common stock, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Common stock, shares authorized (in shares) |
15,000,000
|
15,000,000
|
| Common stock, shares issued (in shares) |
8,466,953
|
8,466,953
|
| Common stock, shares outstanding (in shares) |
7,263,508
|
7,263,508
|
| Series A Preferred Stock [Member] |
|
|
| Preferred shares, par value (in dollars per share) |
$ 0.001
|
$ 0.001
|
| Preferred shares, shares authorized (in shares) |
1,000,000
|
1,000,000
|
| Preferred shares, shares outstanding (in shares) |
0
|
0
|