Note 1 - Summary of Significant Account Policies (Detail) (USD $)	12 Months Ended		13 Months Ended
	Nov. 30, 2012	Nov. 30, 2011	Dec. 30, 2011
Number of Different Banks Where the Company Maintains Accounts	3
Number of Major Customers	1
Entity-Wide Revenue, Major Customer, Percentage	12.00%		8.00%
Accounts Receivable Payment Term	60 days
International Sales Accounts Receivable Payment Term	120 days
Trade Receivables Payment Term	30 days
Overdue Trade Receivables Interest Rate Percent of Account Balances Per Month	1.50%
Finite-Lived Intangible Asset, Useful Life	5 years
Sales Revenue, Goods, Gross (in Dollars)	$ 936,000	$ 532,000
Research and Development Expense (in Dollars)	175,000	125,000
Advertising Expense (in Dollars)	$ 242,000	$ 256,000
Modular Buildings [Member]
Entity-Wide Revenue, Major Customer, Percentage	25.00%
Assets Leased to Others [Member]
Property, Plant and Equipment, Estimated Useful Lives	five
Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	40 years