Earnings Per Share (Detail) (USD $)	3 Months Ended	9 Months Ended
Feb. 28, 2015	Mar. 01, 2014	Feb. 28, 2015	Mar. 01, 2014
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	$ (2,198,000)	$ (112,000)	$ (3,425,000)	$ 2,498,000
Income (loss) from discontinued operations, net of tax	0	(420,000)	87,000	(538,000)
Net income (loss)	(2,198,000)us-gaap_NetIncomeLoss	(532,000)us-gaap_NetIncomeLoss	(3,338,000)us-gaap_NetIncomeLoss	1,960,000us-gaap_NetIncomeLoss
Earnings Per Share, Basic and Diluted [Abstract]
Antidilutive securities excluded from computation of earnings per share (in shares)	886,064	512,064	726,564	512,064
Common Stock
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,604,000	11,832,000	11,733,000	11,942,000
Weighted average shares, diluted (in shares)	13,745,000	14,140,000	13,887,000	14,335,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ (0.16)	$ (0.01)	$ (0.25)	$ 0.18
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ (0.16)	$ (0.01)	$ (0.25)	$ 0.17
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.16)	$ (0.04)	$ (0.24)	$ 0.14
Net income per share, diluted (in dollars per share)	$ (0.16)	$ (0.04)	$ (0.24)	$ 0.13
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	2,154,000	2,270,000
Weighted average shares, diluted (in shares)	2,141,000	2,191,000	2,154,000	2,270,000
Weighted average shares and shares under if-coverted method for diluted EPS, basic (in shares)	$ (0.15)	$ (0.01)	$ (0.22)	$ 0.16
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ (0.15)	$ (0.01)	$ (0.22)	$ 0.16
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.21)	$ 0.13
Net income per share, diluted (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.21)	$ 0.13
Basic
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(3,005)	(1,360)	(5,791)	(553)
Net income (loss)	(2,198)	(532)	(3,338)	1,960
Basic \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed basic earnings (losses)	(2,577)	(1,166)	(4,970)	(472)
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, basic (in shares)	11,604	11,832	11,733	11,942
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.16)	$ (0.04)	$ (0.24)	$ 0.14
Basic \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed basic earnings (losses)	(428)	(194)	(821)	(81)
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	$ 2,154	$ 2,270
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.21)	$ 0.13
Basic \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	(2,198)	(112)	(3,425)	2,498
Undistributed basic earnings (losses)	(3,005)	(940)	(5,878)	(15)
Basic \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed basic earnings (losses)	(2,577)	(806)	(5,045)	(13)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.16)	$ (0.01)	$ (0.25)	$ 0.18
Basic \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed basic earnings (losses)	(428)	(134)	(833)	(2)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ (0.15)	$ (0.01)	$ (0.22)	$ 0.16
Basic \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed basic earnings (losses)	(807)	(1,248)	(2,366)	(3,051)
Income (loss) from discontinued operations, net of tax	0	(420)	87	(538)
Basic \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed basic earnings (losses)	(692)	(1,070)	(2,031)	(2,605)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.00	$ (0.03)	$ 0.01	$ (0.04)
Basic \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed basic earnings (losses)	(115)	(178)	(335)	(446)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, basic (in dollars per share)	$ 0.00	$ (0.03)	$ 0.01	$ (0.03)
Diluted
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(3,005)	(1,360)	(5,791)	(553)
Net income (loss)	(2,198)	(532)	(3,338)	1,960
Denominator for Basic and Diluted Earnings Per Share [Abstract]
Weighted average shares, diluted (in shares)	11,604	11,832	11,733	11,942
Weighted average shares and shares under if-coverted method for diluted EPS, diluted (in shares)	$ 2,141	$ 2,191	$ 2,154	$ 2,270
Effect of dilutive securities dilutive stock options (in shares)	0	117	0	123
Denominator for diluted EPS adjusted for weighted average shares and assumed conversions (in shares)	13,745	14,140	13,887	14,335
Diluted \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed diluted earnings (losses)	(2,577)	(1,166)	(4,970)	(473)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.16)	$ (0.04)	$ (0.24)	$ 0.13
Diluted \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed diluted earnings (losses)	(428)	(194)	(821)	(80)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.15)	$ (0.04)	$ (0.21)	$ 0.13
Diluted \| Continuing Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Income from continuing operations	(2,198)	(112)	(3,425)	2,498
Undistributed diluted earnings (losses)	(3,005)	(940)	(5,878)	(15)
Diluted \| Continuing Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed diluted earnings (losses)	(2,577)	(806)	(5,045)	(13)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.16)	$ (0.01)	$ (0.25)	$ 0.17
Diluted \| Continuing Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed diluted earnings (losses)	(428)	(134)	(833)	(2)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ (0.15)	$ (0.01)	$ (0.22)	$ 0.16
Diluted \| Discontinued Operations
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Undistributed diluted earnings (losses)	(807)	(1,248)	(2,366)	(3,051)
Income (loss) from discontinued operations, net of tax	0	(420)	87	(538)
Diluted \| Discontinued Operations \| Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	691	710	2,103	2,143
Undistributed diluted earnings (losses)	(692)	(1,070)	(2,031)	(2,609)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.00	$ (0.03)	$ 0.01	$ (0.04)
Diluted \| Discontinued Operations \| Class B Common Stock
Numerator for Basic and Diluted Earnings Per Share [Abstract]
Dividends	116	118	350	370
Undistributed diluted earnings (losses)	$ (115)	$ (178)	$ (335)	$ (442)
Earnings Per Share, Basic and Diluted [Abstract]
Net income per share, diluted (in dollars per share)	$ 0.00	$ (0.03)	$ 0.01	$ (0.03)

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-Publisher FASB

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-Section 45

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

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