Condensed Consolidated Statements of Cash Flows (USD $)	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Reconciliation of net income to cash provided (absorbed) by operating activities
Net income (loss)	$ 296,162	$ 442,436
Adjustments to reconcile net income to net cash provided (absorbed) by operating activities:
Depreciation and amortization	357,918	357,089
Stock option compensation expense	0	17,043
Gain on disposal of fixed assets	(50,971)	(20,154)
Deferred taxes	(24,000)	(48,000)
(Increase) decrease in:
Accounts receivable - billed	770,527	1,459,176
Accounts receivable - unbilled	(390,600)	131,200
Inventories	225,205	(636,686)
Prepaid taxes and other assets	408,343	82,013
Increase (decrease) in:
Accounts payable - trade	124,544	92,186
Accrued expenses and other	(32,791)	(940,350)
Customer deposits	(777,075)	(155,433)
Net cash provided (absorbed) by operating activities	907,262	780,520
Cash flows from investing activities:
Purchases of property and equipment	(8,334)	(301,678)
Proceeds from sale of fixed assets	50,993	20,928
Net cash absorbed by investing activities	42,659	(280,750)
Cash flows from financing activities:
Proceeds from long-term borrowings	0	575,000
Repayments of long-term borrowings and capital leases	(220,024)	(200,920)
Proceeds from options exercised	0	105,118
Net cash provided (absorbed) by financing activities	(220,024)	479,198
Net increase (decrease) in cash and cash equivalents	729,897	978,968
Cash and cash equivalents
Beginning of period	2,130,686	2,573,168
End of period	$ 2,860,583	$ 3,552,136