Balance Sheets (Parenthetical) - USD ($)	Sep. 30, 2016	Jun. 30, 2016
Statement of Financial Position [Abstract]
Trade accounts receivable, allowance	$ 3,000	$ 3,000
Advance payments of costs related to contracts in process	$ 18,313	$ 18,313
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	2,364,684	2,364,684
Unearned ESOP, shares	57,500	61,667
Treasury stock, shares	665,190	665,190