Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2015	Jun. 30, 2015
Balance Sheets [Abstract]
Trade accounts receivable, allowance	$ 3,000
Advance payments of costs related to contracts in process	$ 7,596	$ 19,626
Common stock, par value	$ 0.3333	$ 0.3333
Common stock, shares authorized	10,000,000	10,000,000
Common stock, shares issued	3,029,874	3,029,874
Common stock, shares outstanding	2,363,487	2,362,687
Unearned ESOP, shares	74,792	79,167
Treasury stock, shares	666,387	667,187