CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash flows from operating activities
Net income (loss)	$ 36,000	$ (271,000)
Adjustments to reconcile net income (loss) to net cash used in operating activities:
Bad debt expense	0	25,000
Depreciation and amortization	521,000	575,000
Share-based compensation expense	9,000	32,000
Gain on sale of assets	0	(28,000)
Amortization of loan fees included in interest expense	32,000	35,000
Change in assets and liabilities
Receivables	(1,123,000)	(842,000)
Receivables from related parties	47,000	105,000
Inventories	(398,000)	(426,000)
Income tax receivable/payable	(6,000)	5,000
Other assets	(150,000)	(163,000)
Accounts payable	886,000	218,000
Payables and accrued expenses to related parties	(124,000)	(145,000)
Other current liabilities	(153,000)	(60,000)
Net cash used in operating activities	(423,000)	(940,000)
Cash flows from investing activities
Proceeds from sale of property and equipment	0	28,000
Purchases of property and equipment	(104,000)	(54,000)
Net cash used in investing activities	(104,000)	(26,000)
Cash flows from financing activities
Loan fees capitalized	(94,100)	(80,000)
Change in checks in excess of bank	(108,000)	(55,000)
Payments on related party debt	(16,000)	0
Payments on capital lease obligations	(72,000)	(15,000)
Proceeds from revolving line of credit, net	856,000	1,093,000
Net cash from financing activities	566,000	943,000
Net change in cash and cash equivalents	39,000	(23,000)
Cash and cash equivalents at beginning of period	841,000	526,000
Cash and cash equivalents at end of period	880,000	503,000
Supplemental disclosure of cash flow information:
Cash paid for interest	199,000	133,000
Cash paid for taxes	$ 14,000	$ 2,000