Consolidated Statements of Stockholders' Equity - USD ($)	Stock Compensation Plan [Member] Common Stock [Member]	Stock Compensation Plan [Member] Key Executive Deferred Compensation [Member]	Stock Compensation Plan [Member]	Restricted Stock Units (RSUs) [Member] Common Stock [Member]	Restricted Stock Units (RSUs) [Member] Key Executive Deferred Compensation [Member]	Common Stock [Member]	Key Executive Deferred Compensation [Member]	Retained Earnings [Member]	Total
Balance (in shares) at Jun. 30, 2013						24,346,000	(289,000)
Balance at Jun. 30, 2013						$ 105,283,000	$ (2,791,000)	$ 39,198,000	$ 141,690,000
Net income								930,000	930,000
Stock compensation awards (in shares)						23,000
Stock compensation awards						$ 193,000			193,000
Purchase of treasury shares, net (in shares)							(18,000)
Purchase of treasury shares, net							$ (124,000)		(124,000)
Deferred stock compensation						99,000			99,000
Stock option expense						$ 1,005,000			$ 1,004,676
Stock options exercised, net (in shares)						61,000			60,636
Stock options exercised, net						$ 399,000			$ 399,000
Dividends								(5,780,000)	(5,780,000)
Balance (in shares) at Jun. 30, 2014						24,430,000	(307,000)
Balance at Jun. 30, 2014						$ 106,979,000	$ (2,915,000)	34,348,000	138,412,000
Purchase of treasury shares, net							$ (124,000)		(124,000)
Net income								5,151,000	5,151,000
Stock compensation awards (in shares)						27,000
Stock compensation awards						$ 191,000			191,000
Deferred stock compensation						(761,000)			(761,000)
Stock option expense						$ 1,239,000			$ 1,238,897
Stock options exercised, net (in shares)						163,000			163,076
Stock options exercised, net						$ 850,000			$ 850,000
Dividends								(2,900,000)	(2,900,000)
Balance (in shares) at Jun. 30, 2015						24,620,000	(227,000)
Balance at Jun. 30, 2015						$ 108,498,000	$ (2,145,000)	36,599,000	142,952,000
Distribution of treasury shares, net (in shares)							80,000
Distribution of treasury shares, net							$ 770,000		770,000
Net income								9,482,000	9,482,000
Stock compensation awards (in shares)	23,000			5,000
Stock compensation awards	$ 248,000		$ 248,000
Purchase of treasury shares, net (in shares)							(1,000)
Purchase of treasury shares, net							$ (23,000)		(23,000)
Deferred stock compensation						$ 151,000			151,000
Stock option expense									$ 2,519,092
Stock options exercised, net (in shares)						562,000			561,946
Stock options exercised, net						$ 4,021,000			$ 4,021,000
Dividends								(4,214,000)	(4,214,000)
Balance (in shares) at Jun. 30, 2016						25,210,000	(228,000)
Balance at Jun. 30, 2016						$ 115,821,000	$ (2,168,000)	$ 41,867,000	155,520,000
Purchase of treasury shares, net							$ (23,000)		(23,000)
Stock-based compensation expense						$ 2,903,000			$ 2,903,000