Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets
Cash	$ 3,033	$ 1,946
Investment securities, available-for-sale, at fair value	1,134	1,107
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $228 and $214), including contract retentions	9,540	12,281
Trade - unbilled	564	1,313
Inventories, net
Raw materials	744	1,005
Finished goods (less reserves of $39)	2,303	2,555
Prepaid expenses and other assets	402	480
Refundable income taxes	394	909
Total current assets	18,114	21,596
Property and equipment, net	15,254	14,102
Deferred buy-back lease asset, net	5,531	5,304
Other assets	339	367
Total assets	39,238	41,369
Current liabilities
Accounts payable - trade	2,730	4,212
Accrued expenses and other liabilities	585	610
Deferred revenue	1,214	1,112
Accrued compensation	741	1,556
Dividend payable	0	281
Line-of-credit construction draw	1,500	1,000
Deferred buy-back lease obligation	755	720
Operating lease liabilities	110	0
Current maturities of notes payable	719	711
Customer deposits	544	1,658
Total current liabilities	8,898	11,860
Deferred revenue	651	570
Deferred buy-back lease	6,095	5,873
Operating lease liabilities	276	0
Notes payable - less current maturities	2,606	2,792
Deferred tax liability	1,435	1,427
Total liabilities	19,961	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	51	51
Additional paid-in capital	6,057	5,973
Treasury stock, at cost, 40,920 shares	(102)	(102)
Accumulated other comprehensive loss	(22)	(37)
Retained earnings	13,293	12,962
Total stockholders' equity	19,277	18,847
Total liabilities and stockholders' equity	$ 39,238	$ 41,369