Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Cash and cash equivalents	$ 37,246	$ 31,359
Receivables, less allowance for doubtful accounts of $602 at September 30, 2017 and $567 at December 31, 2016	22,044	21,249
Inventories	13,136	14,151
Prepaid expenses	2,234	2,281
Refundable income taxes	979	807
Total current assets	75,639	69,847
Property, plant and equipment	103,797	96,806
Less accumulated depreciation and amortization	(51,815)	(48,290)
Net property, plant and equipment	51,982	48,516
Goodwill	7,322	7,322
Intangible assets, net	79	318
Other assets	2,069	1,931
Total assets	137,091	127,934
Current liabilities:
Accounts payable	4,958	4,002
Accrued expenses	5,356	4,698
Short-term debt	84	856
Total current liabilities	10,398	9,556
Deferred income taxes	3,713	3,459
Non-qualified deferred compensation plan	1,949	1,682
Other liabilities	118	184
Total liabilities	16,178	14,881
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $.01 par value, 1,000,000 shares authorized; zero shares issued or outstanding	0	0
Common stock, $.01 par value, 20,000,000 shares authorized; 7,299,721 and 7,270,162 shares issued and outstanding, respectively at September 30, 2017; and 7,242,023 and 7,212,464 shares issued and outstanding, respectively at December 31, 2016	73	72
Additional paid-in capital	26,580	25,216
Retained earnings	94,847	88,352
Treasury stock at cost, 29,559 shares at September 30, 2017 and December 31, 2016	(587)	(587)
Total stockholders’ equity	120,913	113,053
Total liabilities and stockholders' equity	$ 137,091	$ 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).