Note 5 - Contract Receivables, Contract Assets and Contract Liabilities (Details Textual) - USD ($)	3 Months Ended
	Feb. 28, 2026	Feb. 28, 2025	Nov. 30, 2025	Dec. 01, 2024
Contract with Customer, Liability, Revenue Recognized	$ 403,000	$ 197,000
Construction Contractor, Receivable, Excluding Contract Retainage	3,434,000		$ 2,202,000	$ 2,373,000
Contract with Customer, Asset, after Allowance for Credit Loss	573,000		380,000	213,000
Contract with Customer, Liability	$ 1,710,000		$ 520,000	$ 2,110,000