CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Current assets
Cash	$ 3,936	$ 6,726
Accounts receivable, net
Trade - billed (less allowance of approximately $937 and $781, respectively), including contract retentions	17,867	16,223
Trade - unbilled	2,534	990
Inventories, net
Raw materials	2,705	1,776
Finished goods	2,286	2,042
Prepaid expenses	776	706
Refundable income taxes	476	477
Total current assets	30,580	28,940
Property and equipment, net	25,676	25,124
Other assets	243	249
Total assets	56,499	54,313
Current liabilities
Accounts payable - trade	6,440	5,816
Accrued expenses and other liabilities	745	799
Deferred revenue	2,001	2,243
Accrued compensation	640	788
Accrued income taxes	168	146
Operating lease liabilities	64	77
Current maturities of notes payable	636	618
Customer deposits	2,494	737
Total current liabilities	13,188	11,224
Deferred revenue	2,475	2,174
Operating lease liabilities	34	45
Notes payable - less current maturities	5,558	5,730
Deferred tax liability	2,087	2,085
Total liabilities	23,342	21,258
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 5,345,189 issued and 5,256,413 and 5,256,413 outstanding, respectively	53	53
Additional paid-in capital	7,525	7,440
Treasury stock, at cost, 40,920 shares	(102)	(102)
Retained earnings	25,681	25,664
Total stockholders' equity	33,157	33,055
Total liabilities and stockholders' equity	$ 56,499	$ 54,313