Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets
Cash	$ 1,364	$ 1,946
Investment securities, available-for-sale, at fair value	1,176	1,107
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $333 and $214), including contract retentions	12,723	12,281
Trade - unbilled	310	1,313
Inventories, net
Raw materials	488	1,005
Finished goods	1,754	2,555
Prepaid expenses and other assets	784	480
Refundable income taxes	432	909
Total current assets	19,031	21,596
Property and equipment, net	17,735	14,102
Deferred buy-back lease asset, net	5,042	5,304
Other assets	307	367
Total assets	42,115	41,369
Current liabilities
Accounts payable - trade	3,180	4,212
Accrued expenses and other liabilities	125	610
Deferred revenue	1,891	1,112
Accrued compensation	1,075	1,556
Dividend payable	282	281
Line-of-credit construction draw	0	1,000
Deferred buy-back lease obligation	966	720
Operating lease liabilities	81	0
Current maturities of notes payable	925	711
Customer deposits	1,077	1,658
Total current liabilities	9,602	11,860
Deferred revenue	241	570
Deferred buy-back lease obligation	5,183	5,873
Operating lease liabilities	296	0
Notes payable - less current maturities	4,086	2,792
Deferred tax liability	1,886	1,427
Total liabilities	21,294	22,522
Commitments and contingencies
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; 5,224,911 and 5,223,245 issued and 5,164,324 and 5,112,825 outstanding, respectively	52	51
Additional paid-in capital	6,242	5,973
Treasury stock, at cost, 40,920 shares	(102)	(102)
Other	(10)	(37)
Retained earnings	14,639	12,962
Total stockholders' equity	20,821	18,847
Total liabilities and stockholders' equity	$ 42,115	$ 41,369