Summary of Significant Accounting Policies (Details Textual)	12 Months Ended
	Jun. 30, 2015 USD ($) shares	Jun. 30, 2014 USD ($) shares	Jun. 30, 2013 USD ($) shares
Revenue Recognition Multiple Deliverable Arrangements Determination Of Liability Amount	$ 130,000	$ 130,000
Advertising Expense	32,675	17,904	$ 46,691
FIFO Inventory Amount	2,383,104	2,473,787
Decreases In Cost Of Goods Sold	0	0	171,918
Inventory Valuation Reserves	$ 1,472,956	1,433,718
Entity Number of Employees	232
Collective Bargaining Period Expiry Date	May 31, 2018
Health Care Insurance Accrued Liabilities	$ 195,000	150,000
Gain Contingency, Description	Benefits from tax positions are measured at the largest amount of benefit that is greater than 50 percent likely of being realized upon settlement.
Research and Development Expense	$ 528,285	$ 657,356	$ 937,598
Weighted Average Number of Shares Outstanding, Basic | shares	8,027,147	8,027,147	8,070,645
Weighted Average Number of Shares Outstanding, Diluted | shares	8,027,147	8,027,147	8,070,645
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount | shares	0	0	0
Allocated Share-based Compensation Expense	$ 5,000	$ 10,000	$ 44,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized	1,000
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	$ 2,000	4,000	18,000
Collective Bargaining Agreement [Member]
Entity Number of Employees	135
Minimum [Member]
Property, Plant and Equipment, Useful Life	3 years
Maximum [Member]
Property, Plant and Equipment, Useful Life	35 years
Warranty Service [Member]
Revenue Recognition, Multiple-deliverable Arrangements, Determination of Selling Price, Amount	$ 176,169	$ 113,209	$ 150,944