Supplemental Balance Sheet Information (Details) - USD ($)	12 Months Ended
	Jun. 30, 2015	Jun. 30, 2014
Inventories
Work in progress	$ 545,410	$ 616,474
Component parts	7,721,413	7,605,543
Finished goods	2,397,044	2,617,799
Reserve for obsolete and excess inventory	(1,472,956)	(1,433,718)
Inventory, Net	9,190,911	9,406,098
Property, Plant and Equipment [Abstract]
Total property, plant and equipment at cost	28,680,333	28,591,744
Less accumulated depreciation and amortization	(20,859,127)	(19,656,143)
Total Property, Plant and Equipment, Net	7,821,206	8,935,601
Other accrued liabilities
Accrued compensation expense	1,201,099	1,064,354
Customer deposits	589,276	252,496
Other	369,191	307,336
Other Accrued Liabilities	$ 2,159,566	1,624,186
Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	35 years
Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	3 years
Machinery and Equipment [Member]
Property, Plant and Equipment [Abstract]
Total property, plant and equipment at cost	$ 14,693,789	14,609,438
Machinery and Equipment [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	10 years
Machinery and Equipment [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	3 years
Building [Member]
Property, Plant and Equipment [Abstract]
Total property, plant and equipment at cost	$ 13,052,328	13,048,090
Building [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	35 years
Building [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	28 years
Land and Land Improvements [Member]
Property, Plant and Equipment [Abstract]
Total property, plant and equipment at cost	$ 934,216	$ 934,216
Land and Land Improvements [Member] | Maximum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	7 years
Land and Land Improvements [Member] | Minimum [Member]
Property, Plant and Equipment [Abstract]
Estimated Useful Life	5 years