Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021
Current assets
Cash	$ 6,726	$ 13,492
Accounts receivable, net
Trade - billed (less allowance for doubtful accounts of $781 and $437), including contract retentions	16,223	10,013
Trade - unbilled	990	439
Inventories, net
Raw materials	1,776	1,143
Finished goods	2,042	1,702
Prepaid expenses	706	551
Refundable income taxes	477	411
Total current assets	28,940	27,751
Property and equipment, net	25,124	21,926
Deferred buy-back lease asset, net	0	3,390
Other assets	249	208
Total assets	54,313	53,275
Current liabilities
Accounts payable - trade	5,816	2,071
Accrued expenses and other liabilities	799	657
Deferred revenue	2,243	2,454
Accrued compensation	788	1,036
Accrued income tax	146	2,033
Deferred buy-back lease obligation	0	3,776
Operating lease liabilities	77	89
Current maturities of notes payable	618	462
Customer deposits	737	1,325
Total current liabilities	11,224	13,903
Deferred revenue	2,174	1,865
Operating lease liabilities	45	122
Notes payable - less current maturities	5,730	3,680
Deferred tax liability	2,085	1,955
Total liabilities	21,258	21,525
Commitments and contingencies	0	0
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; 5,345,189 and 5,353,095 issued and 5,256,413 and 5,229,658 outstanding, respectively	53	53
Additional paid-in capital	7,440	6,935
Treasury stock, at cost, 40,920 shares	(102)	(102)
Retained earnings	25,664	24,864
Total stockholders' equity	33,055	31,750
Total liabilities and stockholders' equity	$ 54,313	$ 53,275