Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 11,744	$ 6,677
Trade and other receivables, less allowance for doubtful accounts of $532 and $660	36,632	34,394
Contract assets	90,800	74,271
Inventories	27,287	39,376
Prepaid expenses and other	3,178	4,795
Total current assets	169,641	159,513
Property and equipment, less accumulated depreciation and amortization of $84,477 and $76,861	99,440	103,447
Other assets	16,232	8,390
Total assets	285,313	271,350
Current liabilities:
Accounts payable	7,626	19,784
Accrued liabilities	12,174	7,963
Contract liabilities	10,862	3,745
Total current liabilities	30,662	31,492
Borrowings on line of credit		11,464
Other long-term liabilities	18,898	9,804
Total liabilities	49,560	52,760
Commitments and contingencies (Note 9)
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, 9,746,979 and 9,735,055 shares issued and outstanding	97	97
Additional paid-in-capital	120,051	118,835
Retained earnings	117,315	101,194
Accumulated other comprehensive loss	(1,710)	(1,536)
Total stockholders’ equity	235,753	218,590
Total liabilities and stockholders’ equity	$ 285,313	$ 271,350

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).