CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 28,187	$ 20,353
Marketable securities	25,736	0
Accounts receivable, net of allowance for doubtful accounts of $2,605 and $967, respectively	31,366	60,855
Inventories	52,573	53,728
Prepaid expenses and other	5,448	9,417
Total current assets	143,310	144,353
Property, plant and equipment	180,278	174,741
Less - accumulated depreciation	(70,867)	(66,507)
Property, plant and equipment, net	109,411	108,234
Purchased intangible assets, net	3,665	5,880
Deferred tax assets	4,582	3,836
Other assets	18,677	15,118
Total assets	279,645	277,421
Current liabilities:
Accounts payable	17,574	34,758
Accrued expenses	5,301	6,903
Dividend payable	0	1,866
Accrued income taxes	7,279	9,651
Accrued employee compensation and benefits	7,160	10,668
Contract liabilities	4,928	2,736
Current portion of long-term debt	3,125	3,125
Other current liabilities	1,741	1,716
Total current liabilities	47,108	71,423
Long-term debt	8,139	11,147
Deferred tax liabilities	2,254	3,786
Other long-term liabilities	25,230	18,924
Total liabilities	82,731	105,280
Commitments and Contingencies (Note 9)
Stockholders' Equity:
Preferred stock, $0.05 par value; 4,000,000 shares authorized; no issued and outstanding shares	0	0
Common stock, $0.05 par value; 25,000,000 shares authorized; 15,389,285 and 14,652,675 shares outstanding, respectively	796	756
Additional paid-in capital	117,387	85,639
Retained earnings	115,657	119,002
Other cumulative comprehensive loss	(22,962)	(25,803)
Treasury stock, at cost, and company stock held for deferred compensation, at par; 528,274 and 464,532 shares, respectively	(13,964)	(7,453)
Total stockholders' equity	196,914	172,141
Total liabilities and stockholders' equity	$ 279,645	$ 277,421
Treasury stock, shares (in share)	(528,274)	(464,532)