Consolidated Balance Sheets - USD ($) $ in Thousands		Mar. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents		$ 97,047	$ 79,025
Restricted Cash		725	3,263
Accounts receivable, net of allowance for credit losses of $493 and $506, respectively		52,579	47,387
Income tax receivable		7,353	4,587
Notes receivable		32	31
Inventories, net		84,040	82,219
Prepaid expenses and other		3,631	3,739
Total current assets		245,407	220,251
Property, plant and equipment:
Land		4,109	4,072
Buildings		126,090	122,171
Machinery and equipment		292,961	281,266
Furniture and fixtures		19,971	18,956
Total property, plant and equipment		443,131	426,465
Less: Accumulated depreciation		210,483	203,125
Property, plant and equipment, net		232,648	223,340
Goodwill and intangible assets, net		3,229	3,267
Right of use assets		1,522	1,571
Note receivable		578	579
Total assets		483,384	449,008
Current liabilities:
Accounts payable		17,615	12,447
Accrued liabilities		49,064	46,586
Total current liabilities		66,679	59,033
Deferred tax liabilities		32,982	28,324
Other long-term liabilities		4,312	4,423
New market tax credit obligation	[1]	6,373	6,363
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.001 par value, 5,000,000 shares authorized, no shares issued		0	0
Common stock, $.004 par value, 100,000,000 shares authorized, 52,423,579 and 52,224,767 issued and outstanding at March 31, 2021 and December 31, 2020, respectively		210	209
Additional paid-in capital		10,957	5,161
Retained earnings		361,871	345,495
Total stockholders' equity		373,038	350,865
Total liabilities and stockholders' equity		$ 483,384	$ 449,008

[1]  (a) Held by variable interest entities (Note 14)