INCOME TAXES (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2011
Components of income tax expense
Current taxes - Federal	$ (106,000)	$ 72,000
Current taxes - State	39,000	(21,000)
Current taxes - Foreign	51,000	20,000
Deferred taxes - Federal	137,000	194,000
Deferred taxes - State	(40,000)	35,000
Income tax expense	81,000	300,000
Reconciliation of federal income taxes and reported income taxes
Statutory federal tax provision	327,000	370,000
State income taxes	45,000	45,000
Effect of foreign operations	(9,000)	(3,000)
Uncertain tax positions	(88,000)	41,000
Income tax credits	(215,000)	(167,000)
Permanent differences	21,000	14,000
Income tax expense	81,000	300,000
Income from operations before income taxes
Domestic	816,840	1,074,572
Foreign	144,177	12,804
Income Before Income Taxes	961,017	1,087,376
Components of deferred tax assets (liabilities)
Allowance for uncollectable accounts	50,000	51,000
Inventories reserve	267,000	404,000
Accrued vacation	334,000	386,000
Non-compete amortization	222,000	281,000
Stock-based compensation and equity appreciation rights	148,000	100,000
State Tax NOL carryforwards	95,000	117,000
Other	167,000	144,000
Deferred tax assets	1,283,000	1,483,000
Prepaid expenses	(292,000)	(246,000)
Property and equipment	(704,000)	(836,000)
Deferred tax liabilities	(996,000)	(1,082,000)
Net deferred tax assets	287,000	401,000
Net current deferred tax assets	436,000	683,000
Net non-current deferred tax liabilities	(149,000)	(282,000)
Changes in total gross unrecognized tax benefit liabilities, excluding accrued interest
Balance at the beginning of the period	193,000		140,000
Additions	23,000	53,000
Reductions	0	0
Balance at the end of the period	$ 56,000	$ 193,000	$ 140,000