Consolidated Balance Sheets (Current Period Unaudited) (Parentheticals) - USD ($)	Feb. 29, 2020	Nov. 30, 2019
Trade accounts and notes receivable, allowance for doubtful accounts	$ 21,786	$ 24,792
Property, plant and equipment, accumulated depreciation	156,090	155,752
Definite lived intangible assets, accumulated amortization	$ 125,278	$ 123,949
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