Condensed Consolidated Balance Sheets (Current Period Unaudited) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 5,231	$ 3,238
Receivables, less allowance for doubtful accounts of $501 at June 30, 2019 and $564 at December 31, 2018	30,681	28,321
Inventories	19,038	19,576
Prepaid expenses	2,267	2,206
Refundable income taxes	717	2,285
Total current assets	57,934	55,626
Property, plant and equipment	113,866	111,779
Less accumulated depreciation and amortization	(56,520)	(54,112)
Net property, plant and equipment	57,346	57,667
Goodwill	51,838	51,838
Intangible assets, net	21,603	22,232
Non-qualified deferred compensation plan	2,573	2,034
Operating lease right of use assets	3,531	0
Other assets	140	201
Total assets	194,965	189,598
Current liabilities:
Accounts payable	5,895	6,836
Accrued expenses	7,504	8,458
Deferred revenue	2,951	2,507
Operating lease liabilities, current	984	0
Current portion of long-term debt	3,571	2,857
Total current liabilities	20,905	20,658
Long-term debt, excluding current portion	13,857	22,286
Deferred income taxes	4,966	4,129
Non-qualified deferred compensation plan	2,595	2,044
Operating lease liabilities, noncurrent	2,598	0
Other liabilities	390	24
Total liabilities	45,311	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; 7,457,788 and 7,428,229 shares issued and outstanding, respectively at June 30, 2019; 7,415,002 and 7,385,443 shares issued and outstanding, respectively at December 31, 2018	74	74
Additional paid-in capital	30,033	29,168
Retained earnings	120,134	111,802
Treasury stock at cost, 29,559 shares at June 30, 2019 and 29,559 shares at December 31, 2018	(587)	(587)
Total stockholders’ equity	149,654	140,457
Total liabilities and stockholders' equity	$ 194,965	$ 189,598