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Consolidated Balance Sheets (Parentheticals) - USD ($)
Nov. 30, 2019
Nov. 30, 2018
Trade accounts and notes receivable, allowance for doubtful accounts $ 24,792 $ 39,377
Property, plant and equipment, accumulated depreciation 155,752 155,024
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