Balance Sheets (Unaudited) (USD $)	Mar. 31, 2012	Jun. 30, 2011
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 9,870,589	$ 9,695,811
Investment securities	3,488,847	1,946,214
Trade accounts receivable, net	3,469,608	6,266,765
Raw materials	1,444,204	1,273,582
Work-in-process	792,954	1,085,278
Costs relating to contracts in process, net of advance payments	9,191,851	8,220,200
Total inventories	11,429,009	10,579,060
Deferred income taxes	390,882	360,553
Prepaid expenses and other current assets	222,907	208,904
Total current assets	28,871,842	29,057,307
Property, plant and equipment, net	2,590,832	2,703,014
Loan receivable	77,719	108,303
Total assets	31,540,393	31,868,624
Accounts payable	1,482,776	1,453,707
Accrued expenses:
Salaries, wages and commissions	305,387	412,555
Vacation	676,165	623,757
ESOP payable	112,439
Other	137,724	121,026
Payroll and other taxes withheld and accrued	45,528	44,085
Income taxes payable	176,272	277,746
Total current liabilities	2,936,291	2,932,876
Deferred income taxes	216,831	270,729
Total liabilities	3,153,122	3,203,605
Common stock	1,009,958	1,009,958
Capital in excess of par value	14,856,933	14,674,189
Accumulated other comprehensive income/loss	1,813
Retained earnings	22,410,871	22,780,026
[TotalStockholdersEquityBeforyEsopAndTreasuryStock]	38,279,575	38,464,173
Less: Unearned ESOP shares	(2,275,872)	(2,275,872)
Treasury shares	(7,616,432)	(7,523,282)
Total stockholders' equity	28,387,271	28,665,019
Total liabilities and stockholders' equity	$ 31,540,393	$ 31,868,624