Note 4 - Contract Receivables, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	3 Months Ended
	Feb. 28, 2023	Feb. 28, 2022	Nov. 30, 2022	Dec. 30, 2021	Nov. 30, 2021
Contract with Customer, Liability, Revenue Recognized	$ 827,000	$ 415,000
Construction Contractor, Receivable, Excluding Contract Retainage, Total	3,666,000		$ 2,722,000		$ 2,663,000
Contract with Customer, Asset, after Allowance for Credit Loss, Total	98,000		451,000	$ 177,000
Contract with Customer, Liability, Total	$ 3,474,000		$ 1,157,000	$ 559,000
Increase (Decrease) in Revenue, Percentage	40.70%