Balance Sheets (Unaudited) (USD $)	Dec. 31, 2012	Jun. 30, 2012
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 8,165,231	$ 11,523,424
Investment securities	3,701,011	3,184,711
Trade accounts receivable, net	4,824,571	3,217,875
Income tax receivable	213,416
Raw materials	1,315,018	1,364,019
Work-in-process	760,303	801,092
Costs relating to contracts in process, net of advance payments of $418,897 at December 31, 2012 and $511,502 at June 30, 2012	9,854,018	9,480,595
Total inventories	11,929,339	11,645,706
Deferred income taxes	459,796	422,998
Prepaid expenses and other current assets	101,868	200,322
Total current assets	29,395,232	30,195,036
Property, plant and equipment, net	2,472,374	2,523,196
Loan receivable	46,440	67,371
Total assets	31,914,046	32,785,603
Accounts payable	1,055,071	1,309,037
Accrued expenses:
Salaries, wages and commissions	289,584	417,677
Vacation	613,479	707,760
ESOP payable	70,870
Other	464,766	442,695
Payroll and other taxes withheld and accrued	45,522	44,886
Income taxes payable		73,596
Total current liabilities	2,539,292	2,995,651
Deferred income taxes	195,126	222,504
Total liabilities	2,734,418	3,218,155
Common stock, par value $.33-1/3 per share. Authorized 10,000,000 shares; Issued 3,029,874 shares on December 31, 2012 and June 30, 2012. Outstanding 2,344,543 and 2,320,822 (includes 126,666 and 136,666 Unearned ESOP Shares on December 31, 2012 and June 30, 2012, respectively)	1,009,958	1,009,958
Capital in excess of par value	15,441,952	15,093,512
Accumulated other comprehensive income/loss	3,182	1,477
Retained earnings	22,154,165	23,053,762
[TotalStockholdersEquityBeforyEsopAndTreasuryStock]	38,609,257	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 685,331 and 709,052 shares on December 31, 2012 and June 30, 2012, respectively	(7,454,800)	(7,616,432)
Total stockholders' equity	29,179,628	29,567,448
Total liabilities and stockholders' equity	$ 31,914,046	$ 32,785,603