Note 5 - Contract Receivables, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	9 Months Ended
	Aug. 31, 2023	Aug. 31, 2022	Nov. 30, 2022	Dec. 01, 2021
Contract with Customer, Liability, Revenue Recognized	$ 1,153,000	$ 559,000
Construction Contractor, Receivable, Excluding Contract Retainage	4,456,000		$ 2,467,000	$ 2,380,000
Contract with Customer, Asset, after Allowance for Credit Loss	286,000		451,000	177,000
Contract with Customer, Liability	$ 1,064,000		$ 1,153,000	$ 558,000