Balance Sheets (Unaudited) (USD $)	Sep. 30, 2012	Jun. 30, 2012
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 10,978,191	$ 11,523,424
Investment securities	3,307,302	3,184,711
Trade accounts receivable, net	4,189,427	3,217,875
Income tax receivable	40,707
Raw materials	1,446,928	1,364,019
Work-in-process	847,273	801,092
Costs relating to contracts in process, net of advance payments of $514,151 at September 30, 2012 and $511,502 at June 30, 2012	9,618,948	9,480,595
Total inventories	11,913,149	11,645,706
Deferred income taxes	441,069	422,998
Prepaid expenses and other current assets	170,141	200,322
Total current assets	31,039,986	30,195,036
Property, plant and equipment, net	2,485,556	2,523,196
Loan receivable	56,945	67,371
Total assets	33,582,487	32,785,603
Accounts payable	1,401,289	1,309,037
Accrued expenses:
Salaries, wages and commissions	482,423	417,677
Vacation	607,309	707,760
ESOP payable	108,951
Other	239,606	442,695
Payroll and other taxes withheld and accrued	50,628	44,886
Income taxes payable		73,596
Total current liabilities	2,890,206	2,995,651
Deferred income taxes	208,509	222,504
Total liabilities	3,098,715	3,218,155
Common stock, par value $.33-1/3 per share. Authorized 10,000,000 shares; Issued 3,029,874 shares on September 30, 2012 and June 30, 2012. Outstanding 2,324,743 and 2,320,822 (includes 131,666 and 136,666 Unearned ESOP Shares) on September 30, 2012 and June 30, 2012, respectively	1,009,958	1,009,958
Capital in excess of par value	15,222,798	15,093,512
Accumulated other comprehensive income/loss	1,760	1,477
Retained earnings	23,842,235	23,053,762
[TotalStockholdersEquityBeforyEsopAndTreasuryStock]	40,076,751	39,158,709
Less: Unearned ESOP shares; Cost of 709,052 and 708,914 shares of common stockin treasury in 2012 and 2011, respectively	(1,974,829)	(1,974,829)
Treasury shares, cost of 705,131 and 709,052 shares on September 30, 2012 and June 30, 2012, respectively	(7,618,150)	(7,616,432)
Total stockholders' equity	30,483,772	29,567,448
Total liabilities and stockholders' equity	$ 33,582,487	$ 32,785,603