Condensed Consolidated Statements of Cash Flows (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017
Cash flows from operating activities:
Net income	$ 270,000	$ 1,569,000
Adjustments to reconcile net income to net cash provided by (used in) operating activities:
Depreciation and amortization	504,000	460,000
Gain on sale of assets	(55,000)	(16,000)
Allowance for doubtful accounts	3,000	(150,000)
Stock compensation	186,000	220,000
Deferred taxes	(3,000)	29,000
(Increase) decrease in
Accounts receivable - billed	(2,298,000)	(1,915,000)
Accounts receivable - unbilled	(1,021,000)	32,000
Inventories	424,000	(865,000)
Prepaid expenses and other assets	45,000	(213,000)
Deferred buy-back lease asset, net	(2,986,000)	0
Refundable income taxes	33,000	168,000
Accounts payable - trade	(73,000)	390,000
Accrued expenses and other liabilities	0	400,000
Deferred revenue	54,000	672,000
Accrued income taxes payable	80,000	0
Accrued compensation	(543,000)	(301,000)
Deferred buy-back lease obligation	3,733,000	0
Customer deposits	308,000	790,000
Net cash provided by (used in) operating activities	(1,339,000)	1,270,000
Cash flows from investing activities:
Purchases of investment securities available-for-sale	(16,000)	(21,000)
Purchases of property and equipment	(1,057,000)	(2,159,000)
Proceeds from sale of fixed assets	67,000	22,000
Net cash used in investing activities	(1,006,000)	(2,158,000)
Cash flows from financing activities:
Proceeds from long-term borrowings	350,000	183,000
Repayments of long-term borrowings	(312,000)	(287,000)
Dividends paid on common stock	(256,000)	(49,000)
Proceeds from options exercised	12,000	117,000
Net cash used in financing activities	(206,000)	(36,000)
Net decrease in cash and cash equivalents	(2,551,000)	(924,000)
Cash and cash equivalents
Beginning of period	3,390,000	3,523,000
End of period	$ 839,000	$ 2,599,000