Note 4 - Contract Receivables, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	6 Months Ended
	May 31, 2023	May 31, 2022	Nov. 30, 2022	Dec. 01, 2021
Contract with Customer, Liability, Revenue Recognized	$ 1,145,000	$ 559,000
Construction Contractor, Receivable, Excluding Contract Retainage	3,936,000		$ 2,722,000	$ 2,663,000
Contract with Customer, Asset, after Allowance for Credit Loss	322,000		451,000	177,000
Contract with Customer, Liability	$ 1,345,000		$ 1,157,000	$ 559,000