CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 3,852,000	$ 403,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,318,000	1,180,000
Gain (loss) on sale of assets	(88,000)	(66,000)
Unrealized (gain) loss on investment securities available for sale	(11,000)	(3,000)
Allowance for doubtful accounts	15,000	68,000
Stock compensation	172,000	0
Deferred taxes	(4,000)	3,000
(Increase) decrease in
Accounts receivable - billed	(2,043,000)	1,898,000
Accounts receivable - unbilled	106,000	(192,000)
Inventories	(549,000)	134,000
Prepaid expenses and other assets	73,000	(101,000)
Refundable income taxes	0	136,000
Increase (decrease) in
Accounts payable - trade	1,078,000	(62,000)
Accrued expenses and other liabilities	(298,000)	186,000
Deferred revenue	1,666,000	(6,000)
Accrued compensation	178,000	(190,000)
Accrued income taxes	575,000	0
Deferred buy-back lease obligation	(602,000)	(555,000)
Customer deposits	264,000	(251,000)
Net cash provided by (used in) operating activities	5,702,000	2,582,000
Cash flows from investing activities:
Purchases of investment securities available-for-sale	(13,000)	(15,000)
Purchases of property and equipment	(926,000)	(2,326,000)
Proceeds from sale of fixed assets	88,000	71,000
Net cash provided by (used in) investing activities	(851,000)	(2,270,000)
Cash flows from financing activities:
Proceeds from long-term borrowings	0	5,426,000
Repayments of long-term borrowings	(421,000)	(2,416,000)
Dividends paid on common stock	0	(282,000)
Net cash provided by (used in) financing activities	(421,000)	2,728,000
Net increase (decrease) in cash	4,430,000	3,040,000
Cash
Beginning of period	8,764,000	1,364,000
End of period	13,194,000	4,404,000
Supplemental Cash Flow information:
Cash payments for interest	98,000	113,000
Cash payments for income taxes	$ 713,000	$ 1,000