Stock-based Compensation (Narrative) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Nov. 30, 2007	Jun. 30, 2017	Jun. 30, 2016
Stock based compensation expense		$ 129,167	$ 97,045
Deferred tax benefit related to stock based compensation		11,606	$ 7,971
Unrecognized compensation costs		$ 117,827
Period in which compensation cost will be recognized		1 year 6 months
Deferred tax benefit related to unrecognized compensation costs		$ 10,728
Options granted		41,150
Options outstanding		197,800	170,450
Dividends paid per share		$ 1.00	$ 1.00
Aggregate intrinsic value of options exercised		$ 20,769	$ 40,981
2007 Plan [Member] | Stock Options [Member]
Authorized shares under plan		400,000
Vesting period		2 years
Contractual life	10 years
Options granted		278,300
Options outstanding		197,800