Note 5 - Stock-based Compensation (Details Textual) - USD ($)	1 Months Ended	12 Months Ended
Feb. 25, 2018	Feb. 25, 2018	Feb. 26, 2017	Feb. 28, 2016
Percentage of Stock Options, Exercisable One Year From Date of Grant		25.00%
Percentage of Stock Options Exercisable On Each Succeeding Year from Date of Grant		25.00%
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period		10 years
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	1,800,000	1,800,000
Common Stock, Capital Shares Reserved for Future Issuance	1,459,130	1,459,130
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant	573,576	573,576
Common Stock, Dividends, Per Share, Cash Paid	$ 3
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Intrinsic Value		$ 44,000	$ 0	$ 4,000
Selling, General and Administrative Expenses [Member]
Allocated Share-based Compensation Expense, Total		1,445,000	$ 1,214,000
Modified in 2018 [Member]
Share-based Compensation Arrangement by Share-based Payment Award, Plan Modification, Incremental Compensation Cost		$ 513,000

Percentage of stock options exercisable on each succeeding year from the date of grant.

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Percentage of stock options exercisable one year from date of grant.

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Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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Aggregate number of common shares reserved for future issuance.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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An excess of the fair value of the modified award over the fair value of the award immediately before the modification.

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Period from grant date that an equity-based award expires, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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