Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Current assets:
Cash and cash equivalents	$ 21,829	$ 10,309
Trade and other receivables, less allowance for doubtful accounts of $515 and $751	25,555	27,567
Costs and estimated earnings in excess of billings on uncompleted contracts	43,663	42,592
Inventories	19,037	29,475
Refundable income taxes	159	3,413
Prepaid expenses and other	1,937	1,923
Total current assets	112,180	115,279
Property and equipment, net	118,101	131,848
Other assets	11,274	12,253
Total assets	241,555	259,380
Current liabilities:
Accounts payable	5,267	4,739
Accrued liabilities	10,925	15,971
Billings in excess of costs and estimated earnings on uncompleted contracts	2,038	520
Current portion of capital lease obligations	325	340
Total current liabilities	18,555	21,570
Capital lease obligations, less current portion	602	718
Deferred income taxes	1,282	5,124
Other long-term liabilities	11,903	14,408
Total liabilities	32,342	41,820
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $.01 par value, 10,000,000 shares authorized, none issued or outstanding
Common stock, $.01 par value, 15,000,000 shares authorized, 9,601,011 and 9,564,752 shares issued and outstanding	96	96
Additional paid-in-capital	118,680	117,819
Retained earnings	91,920	101,183
Accumulated other comprehensive loss	(1,483)	(1,538)
Total stockholders’ equity	209,213	217,560
Total liabilities and stockholders’ equity	$ 241,555	$ 259,380

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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- Definition

Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).