Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets
Cash	$ 1,641	$ 1,946
Investment securities, available-for-sale, at fair value	1,156	1,107
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $270 and $214), including contract retentions	11,085	12,281
Trade - unbilled	267	1,313
Inventories, net
Raw materials	499	1,005
Finished goods (less reserves of $39)	2,504	2,555
Prepaid expenses and other assets	553	480
Refundable income taxes	210	909
Total current assets	17,915	21,596
Property and equipment, net	15,894	14,102
Deferred buy-back lease asset, net	5,376	5,304
Other assets	313	367
Total assets	39,498	41,369
Current liabilities
Accounts payable - trade	2,560	4,212
Accrued expenses and other liabilities	184	610
Deferred revenue	1,418	1,112
Accrued compensation	822	1,556
Dividend payable	0	281
Line-of-credit construction draw	1,500	1,000
Deferred buy-back lease obligation	889	720
Operating lease liabilities	107	0
Current maturities of notes payable	740	711
Customer deposits	1,241	1,658
Total current liabilities	9,461	11,860
Deferred revenue	610	570
Deferred buy-back lease	5,738	5,873
Operating lease liabilities	252	0
Notes payable - less current maturities	2,468	2,792
Deferred tax liability	1,339	1,427
Total liabilities	19,868	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	6,126	5,973
Treasury stock, at cost, 40,920 shares	(102)	(102)
Accumulated other comprehensive loss	(12)	(37)
Retained earnings	13,566	12,962
Total stockholders' equity	19,630	18,847
Total liabilities and stockholders' equity	$ 39,498	$ 41,369