Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 37,978	$ 31,359
Receivables, net	21,381	21,249
Inventories	12,863	14,151
Prepaid expenses	1,835	2,281
Refundable income taxes	1,017	807
Total current assets	75,074	69,847
Property, plant, and equipment	106,716	96,806
Less accumulated depreciation and amortization	(53,064)	(48,290)
Net property, plant and equipment	53,652	48,516
Goodwill	7,322	7,322
Intangible assets, net		318
Non-qualified deferred compensation plan	2,015	1,778
Other assets	144	153
Total assets	138,207	127,934
Current liabilities:
Accounts payable	4,180	4,002
Accrued expenses	5,763	4,698
Current installments of long-term debt		856
Total current liabilities	9,943	9,556
Deferred income taxes	2,440	3,459
Non-qualified deferred compensation plan	2,030	1,682
Other liabilities	82	184
Total liabilities	14,495	14,881
Commitments and contingencies (Note 14)
Stockholders’ equity:
Preferred stock, $.01 par value, 1,000,000 shares authorized; no shares issued	0	0
Common stock, $.01 par value, 20,000,000 shares authorized; 7,309,909 and 7,280,350 shares issued and outstanding, respectively at December 31, 2017; and 7,242,023 and 7,212,464 shares issued and outstanding, respectively at December 31, 2016	73	72
Additional paid-in capital	26,664	25,216
Retained earnings	97,562	88,352
Treasury stock at cost, 29,559 shares at December 31, 2017 and 2016 respectively	(587)	(587)
Total stockholders' equity	123,712	113,053
Total liabilities and stockholders' equity	$ 138,207	$ 127,934

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).