Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 17,528	$ 21,829
Trade and other receivables, less allowance for doubtful accounts of $220 and $515	20,975	25,555
Costs and estimated earnings in excess of billings on uncompleted contracts	43,178	43,663
Inventories	22,415	19,037
Refundable income taxes	78	159
Prepaid expenses and other	1,136	1,937
Total current assets	105,310	112,180
Property and equipment, less accumulated depreciation and amortization of $88,201 and $85,604	116,213	118,101
Other assets	10,992	11,274
Total assets	232,515	241,555
Current liabilities:
Accounts payable	7,620	5,267
Accrued liabilities	7,682	10,925
Billings in excess of costs and estimated earnings on uncompleted contracts	1,012	2,038
Current portion of capital lease obligations	258	325
Total current liabilities	16,572	18,555
Capital lease obligations, less current portion	481	602
Deferred income taxes	193	1,282
Other long-term liabilities	11,100	11,903
Total liabilities	28,346	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, 9,619,755 and 9,601,011 shares issued and outstanding	96	96
Additional paid-in-capital	119,382	118,680
Retained earnings	85,984	91,920
Accumulated other comprehensive loss	(1,293)	(1,483)
Total stockholders’ equity	204,169	209,213
Total liabilities and stockholders’ equity	$ 232,515	$ 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).