Note 6 - Contract Receivables, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	3 Months Ended
	Feb. 29, 2024	Feb. 28, 2023	Nov. 30, 2023	Dec. 01, 2022
Contract with Customer, Liability, Revenue Recognized	$ 560,000	$ 1,153,000
Construction Contractor, Receivable, Excluding Contract Retainage	3,046,000		$ 3,432,000	$ 2,466,000
Contract with Customer, Asset, after Allowance for Credit Loss	126,000		289,000	451,000
Contract with Customer, Liability	$ 2,133,000		$ 767,000	$ 1,153,000