Note 4 - Components of Deferred Tax Liabilities and Assets (Details) - USD ($)	Feb. 28, 2016	Mar. 01, 2015
Deferred tax assets:
Depreciation and amortization	$ 3,761,000	$ 3,856,000
Net operating loss carryforwards	10,800,000	14,686,000
Tax credits carryforward	1,363,000	1,811,000
Stock options	1,925,000	1,899,000
Other, net	578,000	531,000
	18,427,000	22,783,000
Valuation allowance on deferred tax assets	(11,115,000)	(11,887,000)
Total deferred tax assets, net of valuation allowance	7,312,000	10,896,000
Deferred tax liabilities:
Depreciation	(526,000)	(446,000)
Undistributed earnings	(48,865,000)	(63,958,000)
Other	(1,281,000)	(1,257,000)
Total deferred tax liabilities	(50,672,000)	(65,661,000)
Net deferred tax liability	$ (43,360,000)	$ (54,765,000)