Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($) $ in Thousands		Mar. 31, 2022		Dec. 31, 2021
Cash and cash equivalent, fair value		$ 12,419,029		$ 15,748,480
Cash, adjusted cost		1,086,600		1,377,094
Money Market Funds, adjusted cost		11,332,429		14,371,386
Cash and cash equivalents, adjusted cost		12,419,029		15,748,480
Corporate Bonds, gross unrealized holding losses		(17,764)		(2,495)
Short-term investment securities		3,021,064		4,511,780
Total, fair value		17,420,449		20,257,765
Total, adjusted		17,438,213		20,260,260
Total, fair value		17,420,449		20,257,765
Short-term Corporate Bonds [Member]
Short-term investment securities	[1],[2]	3,021,064
Corporate Bond Securities [Member]
Short-term investment securities	[3]			4,511,780
Long- term Corporate Bonds [Member]
Short-term investment securities	[2],[4]	1,998,120
Cash [Member]
Cash and cash equivalent, fair value		1,086,600		1,377,094
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalent, fair value		11,332,429		14,371,386	[4]
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Corporate Bonds, fair value		3,009,300	[1],[2]	4,509,285	[3]
Corporate Bonds, gross unrealized holding losses		(11,764)	[1],[2]	$ (2,495)	[3]
Long- term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Corporate Bonds, fair value	[2],[4]	1,992,120
Corporate Bonds, gross unrealized holding losses	[2],[4]	$ (6,000)

[1] Short-term investment securities will mature within 12 months or less, from the applicable reporting date.

[2] The premiums paid to purchase held-to-maturity investment securities was $20,850 and $283,940 for the three months ended March 31, 2022, and 2021 , respectively. The premiums paid to purchase held-to-maturity investment securities was $283,940 for the year ended December 31, 2021.

[3] The premiums paid to purchase held-to-maturity investment securities was $20,850 and $283,940 for the three months ended March 31, 2022, and 2021, respectively. The premiums paid to purchase held-to-maturity investment securities was $283,940 for the year ended December 31, 2021.

[4] Long-term investment securities will mature longer than 12 months from the applicable reporting date.