Financial Instruments (Details) - USD ($) $ in Thousands	May 30, 2020	Feb. 29, 2020
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	$ 12,595
Estimated Fair Value	12,993
Municipal and Corporate Bonds
Debt Securities, Available-for-sale [Line Items]
Amortized Cost	12,595	$ 11,692
Gross Unrealized Gains	403	275
Gross Unrealized Losses	5	0
Estimated Fair Value	$ 12,993	$ 11,967

Amortized cost of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

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-Publisher FASB
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-Topic 320
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Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 210
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