Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets
Cash	$ 1,019	$ 1,946
Investment securities, available-for-sale, at fair value	1,170	1,107
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $329 and $214), including contract retentions	12,067	12,281
Trade - unbilled	539	1,313
Inventories, net
Raw materials	725	1,005
Finished goods (less reserves of $39)	1,842	2,555
Prepaid expenses and other assets	547	480
Refundable income taxes	126	909
Total current assets	18,035	21,596
Property and equipment, net	16,855	14,102
Deferred buy-back lease asset, net	5,222	5,304
Other assets	291	367
Total assets	40,403	41,369
Current liabilities
Accounts payable - trade	3,239	4,212
Accrued expenses and other liabilities	48	610
Deferred revenue	1,354	1,112
Accrued compensation	999	1,556
Dividend payable	0	281
Line-of-credit construction draw	1,500	1,000
Deferred buy-back lease obligation	947	720
Operating lease liabilities	96	0
Current maturities of notes payable	733	711
Customer deposits	1,149	1,658
Total current liabilities	10,066	11,860
Deferred revenue	688	570
Deferred buy-back lease	5,444	5,873
Operating lease liabilities	235	0
Notes payable - less current maturities	2,264	2,792
Deferred tax liability	1,429	1,427
Total liabilities	20,126	22,522
Stockholders' equity
Preferred stock, $.01 par value; authorized 1,000,000 shares, none issued and outstanding	0	0
Common stock, $.01 par value; authorized 8,000,000 shares; 5,225,245 and 5,223,245 issued and 5,134,492 and 5,112,825 outstanding, respectively	52	51
Additional paid-in capital	6,195	5,973
Treasury stock, at cost, 40,920 shares	(102)	(102)
Accumulated other comprehensive loss	(8)	(37)
Retained earnings	14,140	12,962
Total stockholders' equity	20,277	18,847
Total liabilities and stockholders' equity	$ 40,403	$ 41,369