Earnings Per Share (Detail) (USD $)	3 Months Ended	6 Months Ended
Nov. 30, 2013	Dec. 01, 2012	Nov. 30, 2013	Dec. 01, 2012
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	$ 631,000	$ 581,000	$ 2,610,000	$ 1,315,000
Loss from discontinued operations, net of tax	(107,000)	(203,000)	(118,000)	(290,000)
Net income	524,000	378,000	2,492,000	1,025,000
Earnings Per Share, Basic and Diluted [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	512,064	477,064	487,064	267,564
Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Net income
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,871,000	12,437,000	11,997,000	12,604,000
Weighted average shares, diluted (in shares)	14,185,000	15,345,000	14,433,000	15,567,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 0.05	$ 0.04	$ 0.19	$ 0.09
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 0.04	$ 0.04	$ 0.18	$ 0.08
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.04	$ 0.03	$ 0.18	$ 0.07
Net income per share, diluted (in dollars per share)	$ 0.03	$ 0.03	$ 0.17	$ 0.06
Class B Common Stock
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	2,191,000	2,812,000	2,309,000	2,863,000
Weighted average shares, diluted (in shares)	2,191,000	2,812,000	2,309,000	2,863,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 0.04	$ 0.03	$ 0.17	$ 0.08
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 0.04	$ 0.03	$ 0.17	$ 0.08
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.03	$ 0.02	$ 0.16	$ 0.06
Net income per share, diluted (in dollars per share)	$ 0.03	$ 0.02	$ 0.16	$ 0.06
Basic
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(304)	(507)	807	(774)
Net income	524	378	2,492	1,025
Basic \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed basic earnings (losses)	(261)	(421)	688	(643)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,871	12,437	11,997	12,604
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.04	$ 0.03	$ 0.18	$ 0.07
Basic \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed basic earnings (losses)	(43)	(86)	119	(131)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 2,191	$ 2,812	$ 2,309	$ 2,863
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.03	$ 0.02	$ 0.16	$ 0.06
Basic \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	631	581	2,610	1,315
Undistributed basic earnings (losses)	(197)	(304)	925	(484)
Basic \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed basic earnings (losses)	(169)	(253)	788	(402)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.05	$ 0.04	$ 0.19	$ 0.09
Basic \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed basic earnings (losses)	(28)	(51)	137	(82)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.04	$ 0.03	$ 0.17	$ 0.08
Basic \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(935)	(1,088)	(1,803)	(2,089)
Loss from discontinued operations, net of tax	(107)	(203)	(118)	(290)
Basic \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed basic earnings (losses)	(802)	(904)	(1,537)	(1,734)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)
Basic \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed basic earnings (losses)	(133)	(184)	(266)	(355)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)
Diluted
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(304)	(507)	807	(774)
Net income	524	378	2,492	1,025
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, diluted (in shares)	11,871	12,437	11,997	12,604
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 2,191	$ 2,812	$ 2,309	$ 2,863
Effect of dilutive securities dilutive stock options (in shares)	123	96	127	100
Denominator for diluted EPS adjusted for weighted average shares and assumed conversions (in shares)	14,185	15,345	14,433	15,567
Diluted \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed diluted earnings (losses)	(261)	(422)	689	(643)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.03	$ 0.03	$ 0.17	$ 0.06
Diluted \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed diluted earnings (losses)	(43)	(85)	118	(131)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.03	$ 0.02	$ 0.16	$ 0.06
Diluted \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	631	581	2,610	1,315
Undistributed diluted earnings (losses)	(197)	(304)	925	(484)
Diluted \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed diluted earnings (losses)	(169)	(253)	790	(402)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.04	$ 0.04	$ 0.18	$ 0.08
Diluted \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed diluted earnings (losses)	(28)	(51)	135	(82)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.04	$ 0.03	$ 0.17	$ 0.08
Diluted \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(935)	(1,088)	(1,803)	(2,089)
Loss from discontinued operations, net of tax	(107)	(203)	(118)	(290)
Diluted \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	710	737	1,433	1,495
Undistributed diluted earnings (losses)	(803)	(905)	(1,539)	(1,737)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.01)	$ (0.01)	$ (0.01)	$ (0.02)
Diluted \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	118	148	252	304
Undistributed diluted earnings (losses)	$ (132)	$ (183)	$ (264)	$ (352)
Earnings Per Share, Basic and Diluted [Abstract]
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The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60B

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780133-109256

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

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-Section 45

-Paragraph 60A

-URI http://asc.fasb.org/extlink&oid=7655603&loc=SL5780132-109256

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 60

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2740-109256

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 66

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2814-109256

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 260

-SubTopic 10

-Section 45

-Paragraph 65

-URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e2793-109256

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- Definition

The earnings that is allocated to common stock and participating securities to the extent that each security may share in earnings as if all of the earnings for the period had been distributed. Includes the adjustments resulting from the assumption that dilutive securities were converted, options or warrants were exercised, or that other shares were issued upon the satisfaction of certain conditions.

+ References

No definition available.

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The sum of dilutive potential common shares or units used in the calculation of the diluted per-share or per-unit computation.

+ References

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The average number of shares or units issued and outstanding that are used in calculating diluted EPS or earnings per unit (EPU), determined based on the timing of issuance of shares or units in the period.

+ References

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Number of [basic] shares or units, after adjustment for contingently issuable shares or units and other shares or units not deemed outstanding, determined by relating the portion of time within a reporting period that common shares or units have been outstanding to the total time in that period.

+ References

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