Balance Sheets (USD $)	Jun. 30, 2012	Jun. 30, 2011
Statement of Financial Position [Abstract]
Cash and cash equivalents	$ 11,523,424	$ 9,695,811
Investment securities	3,184,711	1,946,214
Trade accounts receivable, net	3,217,875	6,266,765
Raw materials	1,364,019	1,273,582
Work-in-process	801,092	1,085,278
Costs related to contracts in process, net of progress payments of $511,502 in 2012 and $126,361 in 2011	9,480,595	8,220,200
Total inventories	11,645,706	10,579,060
Deferred income taxes	422,998	360,553
Prepaid expenses and other current assets	200,322	208,904
Total current assets	30,195,036	29,057,307
Property, plant and equipment, net	2,523,196	2,703,014
Loan receivable	67,371	108,303
Total assets	32,785,603	31,868,624
Accounts payable	1,309,037	1,453,707
Accrued expenses:
Salaries, wages and commissions	417,677	412,555
Vacation	707,760	623,757
Other	442,695	121,026
Payroll and other taxes withheld and accrued	44,886	44,085
Income taxes payable	73,596	277,746
Total current liabilities	2,995,651	2,932,876
Deferred income taxes	222,504	270,729
Total liabilities	3,218,155	3,203,605
Common stock, par value $.33-1/3 per share: Authorized 10,000,000 shares; Issued 3,029,874 shares in 2012 and 2011. Outstanding 2,320,822 and 2,320,960 in 2012 and2011, respectively (includes 136,666 and 157, 500 Unearned ESOP Shares)	1,009,958	1,009,958
Capital in excess of par value	15,093,512	14,674,189
Accumulated other comprehensive income/loss	1,477
Retained earnings	23,053,762	22,780,026
[TotalStockholdersEquityBeforyEsopAndTreasuryStock]	39,158,709	38,464,173
Less: Unearned ESOP shares; Cost of 709,052 and 708,914 shares of common stockin treasury in 2012 and 2011, respectively	(1,974,829)	(2,275,872)
Treasury shares	(7,616,432)	(7,523,282)
Total stockholders' equity	29,567,448	28,665,019
Total liabilities and stockholders' equity	$ 32,785,603	$ 31,868,624