Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 3,238	$ 37,978
Receivables, net	28,321	21,381
Inventories	19,576	12,863
Prepaid expenses	2,206	1,835
Refundable income taxes	2,285	1,017
Total current assets	55,626	75,074
Property, plant, and equipment	111,779	106,716
Less accumulated depreciation and amortization	(54,112)	(53,064)
Net property, plant and equipment	57,667	53,652
Goodwill	51,838	7,322
Intangible assets, net	22,232
Non-qualified deferred compensation plan	2,034	2,015
Other assets	201	144
Total assets	189,598	138,207
Current liabilities:
Accounts payable	6,836	4,180
Accrued expenses	8,458	5,466
Deferred revenue	2,507	297
Current installments of long-term debt	2,857
Total current liabilities	20,658	9,943
Long-term debt, excluding current portion	22,286
Deferred income taxes	4,129	2,440
Non-qualified deferred compensation plan	2,044	2,030
Other liabilities	24	82
Total liabilities	49,141	14,495
Commitments and contingencies (Note 15)
Stockholders’ equity:
Preferred stock, $.01 par value, 1,000,000 shares authorized; no shares issued
Common stock, $.01 par value, 20,000,000 shares authorized; 7,415,002 and 7,385,443 shares issued and outstanding, respectively at December 31, 2018; and 7,309,909 and 7,280,350 shares issued and outstanding, respectively, at December 31, 2017	74	73
Additional paid-in capital	29,168	26,664
Retained earnings	111,802	97,562
Treasury stock at cost, 29,559 shares at both December 31, 2018 and 2017	(587)	(587)
Total stockholders' equity	140,457	123,712
Total liabilities and stockholders' equity	$ 189,598	$ 138,207

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).