Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
CURRENT ASSETS:
Cash and cash equivalents	$ 423,371,036	$ 296,321,622
Short-term investments	27,164,369	140,384,053
Accounts receivable, net	284,925,335	235,410,326
Inventories, net	226,291,843	248,941,855
Prepaid expenses and other	17,577,981	29,319,036
Total current assets	979,330,564	950,376,892
PLANT AND EQUIPMENT:
Land, buildings and improvements	350,574,243	344,231,180
Machinery and equipment	857,583,647	843,439,691
Construction-in-process	49,048,555	39,456,490
Total Plant and Equipment	1,257,206,445	1,227,127,361
Less- Accumulated depreciation	(789,071,310)	(728,811,261)
Net Plant and Equipment	468,135,135	498,316,100
OTHER ASSETS:
Goodwill	311,922,787	307,365,845
Long-term investments	162,028,068	139,909,323
Intangible assets, net	249,748,127	250,375,000
Patents and other assets, net	26,776,489	22,460,033
Total Other Assets	750,475,471	720,110,201
TOTAL ASSETS	2,197,941,170	2,168,803,193
CURRENT LIABILITIES:
Accounts payable	84,784,423	97,553,917
Accrued liabilities:
Salaries, wages and vacation	18,557,799	16,385,833
Income taxes	3,790,219	24,952
Royalties	21,056,412	17,371,829
Dividends payable	29,243,144	28,896,914
Other	20,304,860	11,613,355
Total current liabilities	177,736,857	171,846,800
OTHER NON-CURRENT LIABILITIES	17,300,442	7,414,424
DEFERRED INCOME TAXES	38,960,743	51,454,149
TOTAL LIABILITIES	233,998,042	230,715,373
SHAREHOLDERS’ INVESTMENT:
Common stock, par value 0.06 per share; 400,000,000 shares authorized; 243,692,869 and 251,277,515 shares issued and outstanding in 2020 and 2019 respectively.	14,621,572	15,076,651
Additional paid-in capital	852,771,508	807,928,139
Retained earnings	1,089,698,996	1,116,372,133
Accumulated other comprehensive income:
Unrealized gain on investments, net	6,082,007	1,095,486
Cumulative translation adjustment	769,045	(2,384,589)
Total shareholders’ investment	1,963,943,128	1,938,087,820
TOTAL LIABILITIES AND SHAREHOLDERS' INVESTMENT	$ 2,197,941,170	$ 2,168,803,193