Note 3 - Allowance for Doubtful Accounts - Activity in the Allowance for Doubtful Accounts (Details) - USD ($)	12 Months Ended
	Nov. 30, 2019	Nov. 30, 2018
Balance, beginning	$ 25,100	$ 32,298
Provision charged to expense	(1,602)	2,242
Less amounts charged-off	(573)	(9,440)
Balance, ending	$ 22,925	$ 25,100