Earnings Per Share (Detail) (USD $)	3 Months Ended	6 Months Ended
Nov. 29, 2014	Nov. 30, 2013	Nov. 29, 2014	Nov. 30, 2013
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	$ (1,144,000)	$ 631,000	$ (1,227,000)	$ 2,610,000
Income (loss) from discontinued operations, net of tax	87,000	(107,000)	87,000	(118,000)
Net income (loss)	(1,057,000)us-gaap_NetIncomeLoss	524,000us-gaap_NetIncomeLoss	(1,140,000)us-gaap_NetIncomeLoss	2,492,000us-gaap_NetIncomeLoss
Earnings Per Share, Basic and Diluted [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	666,564	512,064	661,564	487,064
Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Net income (loss)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,770,000	11,871,000	11,797,000	11,997,000
Weighted average shares, diluted (in shares)	11,770,000	14,185,000	11,797,000	14,433,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ (0.08)	$ 0.05	$ (0.09)	$ 0.19
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ (0.08)	$ 0.04	$ (0.09)	$ 0.18
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.18
Net income per share, diluted (in dollars per share)	$ (0.07)	$ 0.03	$ (0.08)	$ 0.17
Class B Common Stock
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	2,141,000	2,191,000	2,161,000	2,309,000
Weighted average shares, diluted (in shares)	2,141,000	2,191,000	2,161,000	2,309,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.17
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.17
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.06)	$ 0.03	$ (0.07)	$ 0.16
Net income per share, diluted (in dollars per share)	$ (0.06)	$ 0.03	$ (0.07)	$ 0.16
Basic
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(1,874)	(304)	(2,785)	807
Net income (loss)	(1,057)	524	(1,140)	2,492
Basic \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed basic earnings (losses)	(1,610)	(261)	(2,391)	688
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,770	11,871	11,797	11,997
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.18
Basic \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed basic earnings (losses)	(264)	(43)	(394)	119
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ 2,141	$ 2,191	$ 2,161	$ 2,309
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.06)	$ 0.03	$ (0.07)	$ 0.16
Basic \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	(1,144)	631	(1,227)	2,610
Undistributed basic earnings (losses)	(1,961)	(197)	(2,872)	925
Basic \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed basic earnings (losses)	(1,685)	(169)	(2,466)	788
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.08)	$ 0.05	$ (0.09)	$ 0.19
Basic \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed basic earnings (losses)	(276)	(28)	(406)	137
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.17
Basic \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(730)	(935)	(1,558)	(1,803)
Income (loss) from discontinued operations, net of tax	87	(107)	87	(118)
Basic \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed basic earnings (losses)	(627)	(802)	(1,337)	(1,537)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ (0.01)
Basic \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed basic earnings (losses)	(103)	(133)	(221)	(266)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ (0.01)
Diluted
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(1,874)	(304)	(2,785)	807
Net income (loss)	(1,057)	524	(1,140)	2,492
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, diluted (in shares)	11,770	11,871	11,797	11,997
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 2,141	$ 2,191	$ 2,161	$ 2,309
Effect of dilutive securities dilutive stock options (in shares)	0	123	0	127
Denominator for diluted EPS adjusted for weighted average shares and assumed conversions (in shares)	13,911	14,185	13,958	14,433
Diluted \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed diluted earnings (losses)	(1,610)	(261)	(2,391)	689
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.07)	$ 0.03	$ (0.08)	$ 0.17
Diluted \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed diluted earnings (losses)	(264)	(43)	(394)	118
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.06)	$ 0.03	$ (0.07)	$ 0.16
Diluted \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	(1,144)	631	(1,227)	2,610
Undistributed diluted earnings (losses)	(1,961)	(197)	(2,872)	925
Diluted \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed diluted earnings (losses)	(1,685)	(169)	(2,466)	790
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.08)	$ 0.04	$ (0.09)	$ 0.18
Diluted \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed diluted earnings (losses)	(276)	(28)	(406)	135
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.07)	$ 0.04	$ (0.08)	$ 0.17
Diluted \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(730)	(935)	(1,558)	(1,803)
Income (loss) from discontinued operations, net of tax	87	(107)	87	(118)
Diluted \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	701	710	1,411	1,433
Undistributed diluted earnings (losses)	(627)	(803)	(1,337)	(1,539)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ (0.01)
Diluted \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	234	252
Undistributed diluted earnings (losses)	$ (103)	$ (132)	$ (221)	$ (264)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.01	$ (0.01)	$ 0.01	$ (0.01)

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-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

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-Name Accounting Standards Codification

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