Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 20,807	$ 21,829
Trade and other receivables, less allowance for doubtful accounts of $496 and $515	18,616	25,555
Costs and estimated earnings in excess of billings on uncompleted contracts	45,063	43,663
Inventories	16,954	19,037
Prepaid expenses and other	1,772	2,096
Total current assets	103,212	112,180
Property and equipment, less accumulated depreciation and amortization of $87,024 and $85,604	116,848	118,101
Other assets	11,054	11,274
Total assets	231,114	241,555
Current liabilities:
Accounts payable	3,627	5,267
Accrued liabilities	7,140	10,925
Billings in excess of costs and estimated earnings on uncompleted contracts	940	2,038
Current portion of capital lease obligations	288	325
Total current liabilities	11,995	18,555
Capital lease obligations, less current portion	539	602
Deferred income taxes	1,044	1,282
Other long-term liabilities	11,849	11,903
Total liabilities	25,427	32,342
Commitments and contingencies (Note 6)
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, 9,604,811 and 9,601,011 shares issued and outstanding	96	96
Additional paid-in-capital	118,927	118,680
Retained earnings	88,052	91,920
Accumulated other comprehensive loss	(1,388)	(1,483)
Total stockholders’ equity	205,687	209,213
Total liabilities and stockholders’ equity	$ 231,114	$ 241,555

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).