CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) - USD ($)	9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020
Cash flows from operating activities:
Net income (loss)	$ 7,546,000	$ 1,952,000
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation and amortization	1,976,000	1,791,000
Gain on forgiveness of PPP loan	(2,692,000)	0
Gain (loss) on sale of assets	(293,000)	(58,000)
Unrealized (gain) loss on investment securities available for sale	5,000	(16,000)
Allowance for doubtful accounts	25,000	55,000
Stock compensation	258,000	0
Deferred taxes	(3,000)	(5,000)
(Increase) decrease in
Accounts receivable - billed	(2,799,000)	2,915,000
Accounts receivable - unbilled	259,000	(393,000)
Inventories	(1,002,000)	78,000
Prepaid expenses and other assets	10,000	(96,000)
Refundable income taxes	0	309,000
Increase (decrease) in
Accounts payable - trade	1,300,000	(681,000)
Accrued expenses and other liabilities	(86,000)	891,000
Deferred revenue	1,959,000	2,000
Accrued compensation	(68,000)	267,000
Accrued income taxes	1,016,000	305,000
Deferred buy-back lease obligation	(903,000)	(855,000)
Customer deposits	1,054,000	(483,000)
Net cash provided by (used in) operating activities	7,562,000	5,978,000
Cash flows from investing activities:
Purchases of investment securities available-for-sale	(20,000)	(22,000)
Purchases of property and equipment	(1,210,000)	(2,501,000)
Proceeds from sale of fixed assets	466,000	144,000
Net cash provided by (used in) investing activities	(764,000)	(2,379,000)
Cash flows from financing activities:
Proceeds from long-term borrowings	50,000	5,426,000
Repayments of long-term borrowings	(617,000)	(2,658,000)
Dividends paid on common stock	0	(282,000)
Net cash provided by (used in) financing activities	(567,000)	2,486,000
Net increase (decrease) in cash	6,231,000	6,085,000
Cash
Beginning of period	8,764,000	1,364,000
End of period	14,995,000	7,449,000
Supplemental Cash Flow information:
Cash payments for interest	145,000	166,000
Cash payments for income taxes	713,000	1,000
Non-cash transaction - PPP loan forgiveness	$ 2,692,000	$ 0