Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 34,514	$ 31,359
Receivables, less allowance for doubtful accounts of $617 at June 30, 2017 and $567 at December 31, 2016	22,306	21,249
Inventories	14,095	14,151
Prepaid expenses	2,455	2,281
Refundable income taxes	9	807
Total current assets	73,379	69,847
Property, plant and equipment	101,357	96,806
Less accumulated depreciation and amortization	(50,521)	(48,290)
Net property, plant and equipment	50,836	48,516
Goodwill	7,322	7,322
Intangible assets, net	159	318
Other assets	1,994	1,931
Total assets	133,690	127,934
Current liabilities:
Accounts payable	4,394	4,002
Accrued expenses	4,629	4,698
Current installments of long-term debt	342	856
Total current liabilities	9,365	9,556
Deferred income taxes	3,619	3,459
Non-qualified deferred compensation plan	1,876	1,682
Other liabilities	132	184
Total liabilities	14,992	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; 7,281,632 and 7,252,073 shares issued and outstanding, respectively at June 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	26,059	25,216
Retained earnings	93,153	88,352
Treasury stock at cost, 29,559 shares at June 30, 2017 and December 31, 2016	(587)	(587)
Total stockholders’ equity	118,698	113,053
Total liabilities and stockholders' equity	$ 133,690	$ 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).