Balance Sheets (Parenthetical) - USD ($)	Mar. 31, 2016	Jun. 30, 2015
Balance Sheets [Abstract]
Trade accounts receivable, allowance	$ 3,000	$ 3,000
Advance payments of costs related to contracts in process	$ 18,313	$ 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	2,361,084	2,362,687
Unearned ESOP, shares	66,042	79,167
Treasury stock, shares	677,690	667,187