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Note 2 - Cash, Cash Equivalents, and Investments (Tables)

3 Months Ended

Mar. 31, 2023

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		*March 31, 2023 (Unaudited)*
									*Allowance*				*Gross*				*Gross*
		*Level*							*for*				*Unrealized*				*Unrealized*
		*(1)*			*Fair Value*				*Credit Losses*				*Holding Gains*				*Holding Losses*				*Adjusted Cost*
Cash and Cash Equivalents
Cash					$	139,306			$	—			$	—			$	—			$	139,306
Money Market Funds ⁽²⁾		1				6,234,784				—				—				—				6,234,784
Subtotal						6,374,090				—				—				—				6,374,090
Short-Term Investment Securities ⁽³⁾
Corporate Bonds ⁽⁴⁾⁽⁵⁾		2				5,340,244				—				1,727				(24,118	)			5,362,635
Total					$	11,714,334			$	—			$	1,727			$	(24,118	)		$	11,736,725

		*December 31, 2022 (Audited)*
									*Allowance*				*Gross*				*Gross*
		*Level*							*for*				*Unrealized*				*Unrealized*
		*(1)*			*Fair Value*				*Credit Losses*				*Holding Gains*				*Holding Losses*				*Adjusted Cost*
Cash and Cash Equivalents
Cash					$	26,782			$	—			$	—			$	—			$	26,782
Money Market Funds ⁽²⁾		1				5,767,490				—				—				—				5,767,490
Subtotal						5,794,272				—				—				—				5,794,272
Short-Term Investment Securities⁽³⁾
Corporate Bonds ⁽⁴⁾⁽⁵⁾		2				6,800,062				—				—				(47,208	)			6,847,270
Total					$	12,594,334			$	—			$	—			$	(47,208	)		$	12,641,542