INCOME TAXES (Details) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Components of income tax expense
Current taxes - Federal	$ (297,000)	$ (106,000)
Current taxes - State	6,000	39,000
Current taxes - Foreign	29,000	51,000
Deferred taxes - Federal	(107,000)	137,000
Deferred taxes - State	53,000	(40,000)
Income tax (benefit) expense	(316,000)	81,000
Reconciliation of federal income taxes and reported income taxes
Statutory federal tax provision (benefit)	(302,000)	327,000
State income taxes	3,000	45,000
Effect of foreign operations	(5,000)	(9,000)
Uncertain tax positions	(3,000)	(88,000)
Income tax credits	(125,000)	(215,000)
Valuation allowance	86,000
Permanent differences	30,000	21,000
Income tax (benefit) expense	(316,000)	81,000
Income from operations before income taxes
Domestic	(968,793)	816,840
Foreign	81,371	144,177
Income (Loss) Before Income Taxes	(887,422)	961,017
Components of deferred tax assets (liabilities)
Allowance for uncollectable accounts	115,000	50,000
Inventories reserve	270,000	267,000
Accrued vacation	360,000	334,000
Non-compete amortization	191,000	222,000
Stock-based compensation and equity appreciation rights	111,000	148,000
State Tax NOL	113,000	95,000
Tax credit carryforwards	231,000	73,000
Other	180,000	94,000
Deferred tax assets before valuation allowance	1,571,000	1,283,000
Valuation allowance	(86,000)
Deferred tax assets	1,485,000	1,283,000
Prepaid expenses	(481,000)	(292,000)
Property and equipment	(663,000)	(704,000)
Deferred tax liabilities	(1,144,000)	(996,000)
Net deferred tax assets	341,000	287,000
Net non-current deferred tax liabilities		149,000
Noncurrent deferred tax asset		436,000
Changes in total gross unrecognized tax benefit liabilities, excluding accrued interest
Balance at the beginning of the period	56,000	193,000
Additions based on tax positions related to the current year	12,000	23,000
Additions based on tax positions related to a prior year	2,000
Reductions based on tax positions related to a prior year	9,000
Statute of limitations	(10,000)
Reductions		(160,000)
Balance at the end of the period	$ 51,000	$ 56,000