Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 2,493	$ 3,238
Receivables, less allowance for doubtful accounts of $496 at March 31, 2019 and $564 at December 31, 2018	29,772	28,321
Inventories	19,437	19,576
Prepaid expenses	1,842	2,206
Refundable income taxes	1,504	2,285
Total current assets	55,048	55,626
Property, plant and equipment	113,275	111,779
Less accumulated depreciation and amortization	(55,820)	(54,112)
Net property, plant and equipment	57,455	57,667
Goodwill	51,838	51,838
Intangible assets, net	21,918	22,232
Non-qualified deferred compensation plan	2,482	2,034
Operating lease right of use assets	3,785	0
Other assets	137	201
Total assets	192,663	189,598
Current liabilities:
Accounts payable	6,037	6,836
Accrued expenses	5,952	8,458
Deferred revenue	2,972	2,507
Operating lease liabilities, current	1,152	0
Current portion of long-term debt	2,857	2,857
Total current liabilities	18,970	20,658
Long-term debt, excluding current portion	19,286	22,286
Deferred income taxes	4,553	4,129
Non-qualified deferred compensation plan	2,481	2,044
Operating lease liabilities, noncurrent	2,679	0
Other liabilities	195	24
Total liabilities	48,164	49,141
Commitments and contingencies
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; 7,443,935 and 7,414,376 shares issued and outstanding, respectively at March 31, 2019;7,415,002 and 7,385,443 shares issued and outstanding, respectively at December 31, 2018	74	74
Additional paid-in capital	29,476	29,168
Retained earnings	115,536	111,802
Treasury stock at cost, 29,559 shares at March 31, 2019 and at December 31, 2018	(587)	(587)
Total stockholders’ equity	144,499	140,457
Total liabilities and stockholders' equity	$ 192,663	$ 189,598

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).