Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2020	Dec. 31, 2019
Current assets
Cash	$ 4,404	$ 1,364
Investment securities, available-for-sale, at fair value	1,189	1,176
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $401 and $333), including contract retentions	10,757	12,723
Trade - unbilled	502	310
Inventories, net
Raw materials	642	488
Finished goods	1,466	1,754
Prepaid expenses and other assets	845	784
Refundable income taxes	296	432
Total current assets	20,101	19,031
Property and equipment, net	19,240	17,735
Deferred buy-back lease asset, net	4,655	5,042
Other assets	335	307
Total assets	44,331	42,115
Current liabilities
Accounts payable - trade	3,118	3,180
Accrued expenses and other liabilities	311	125
Deferred revenue	1,614	1,891
Accrued compensation	885	1,075
Dividend payable	0	282
Deferred buy-back lease obligation	1,184	966
Operating lease liabilities	82	81
Current maturities of notes payable	2,057	925
Customer deposits	826	1,077
Total current liabilities	10,077	9,602
Deferred revenue	512	241
Deferred buy-back lease obligation	4,410	5,183
Operating lease liabilities	254	296
Notes payable - less current maturities	5,965	4,086
Deferred tax liability	1,889	1,886
Total liabilities	23,107	21,294
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 5,224,911 issued and 5,183,991 and 5,164,324 outstanding, respectively	52	52
Additional paid-in capital	6,242	6,242
Treasury stock, at cost, 40,920 shares	(102)	(102)
Retained earnings	15,032	14,629
Total stockholders' equity	21,224	20,821
Total liabilities and stockholders' equity	$ 44,331	$ 42,115