Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 10,054	$ 6,677
Trade and other receivables, less allowance for doubtful accounts of $558 and $660	30,162	34,394
Contract assets	84,093	74,271
Inventories	33,513	39,376
Prepaid expenses and other	3,983	4,795
Total current assets	161,805	159,513
Property and equipment, less accumulated depreciation and amortization of $81,050 and $76,861	100,285	103,447
Other assets	16,962	8,390
Total assets	279,052	271,350
Current liabilities:
Accounts payable	12,694	19,784
Accrued liabilities	10,725	7,963
Contract liabilities	13,986	3,745
Total current liabilities	37,405	31,492
Borrowings on line of credit		11,464
Other long-term liabilities	17,205	9,804
Total liabilities	54,610	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, 9,744,827 and 9,735,055 shares issued and outstanding	97	97
Additional paid-in-capital	119,510	118,835
Retained earnings	106,568	101,194
Accumulated other comprehensive loss	(1,733)	(1,536)
Total stockholders’ equity	224,442	218,590
Total liabilities and stockholders’ equity	$ 279,052	$ 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).