Note 11 - Employee Benefit Plans (Details Textual) - USD ($)		12 Months Ended
	Jan. 01, 2021	Nov. 30, 2020	Nov. 30, 2019
Defined Contribution Plan, Employer Matching Contribution, Percent of Match		25.00%
Defined Contribution Plan Minimum Threshold Percentage of Employee Contributions		4.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent		1.00%
Defined Contribution Plan, Cost		$ 32,464	$ 36,253
Subsequent Event [Member]
Defined Contribution Plan, Employer Matching Contribution, Percent of Match	50.00%
Defined Contribution Plan, Maximum Annual Contributions Per Employee, Percent	3.00%