Note 4 - Income Taxes - Components of Deferred Tax Liabilities and Assets (Details) - USD ($)	Feb. 26, 2017	Feb. 28, 2016
Deferred tax assets:
Depreciation and amortization	$ 3,740,000	$ 3,761,000
Net operating loss carryforwards	11,049,000	10,800,000
Tax credits carryforward	677,000	1,363,000
Stock options	1,865,000	1,925,000
Other, net	282,000	578,000
	17,613,000	18,427,000
Valuation allowance on deferred tax assets	(10,571,000)	(11,115,000)
Total deferred tax assets, net of valuation allowance	7,042,000	7,312,000
Deferred tax liabilities:
Depreciation	(572,000)	(526,000)
Undistributed earnings	(47,509,000)	(48,865,000)
Other	(781,000)	(1,281,000)
Total deferred tax liabilities	(48,862,000)	(50,672,000)
Net deferred tax liability	$ (41,820,000)	$ (43,360,000)