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

12 Months Ended

Dec. 31, 2021

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		*December 31, 2021*
									*Gross*				*Gross*
		*Level*							*Unrealized*				*Unrealized*
		*(1)*			*Fair Value*				*Holding Gains*				*Holding Losses*				*Adjusted Cost*
Cash and Cash Equivalents
Cash					$	1,377,094			$	—			$	—			$	1,377,094
Money Market Funds		1				14,371,386				—				—			$	14,371,386
Subtotal						15,748,480				—				—				15,748,480
Short-Term Investment Securities ⁽²⁾
Corporate Bonds ⁽³⁾		2				4,509,285				—				(2,495	)		$	4,511,780
Total					$	20,257,765			$	—			$	(2,495	)		$	20,260,260

		December 31, 2020
									Gross				Gross
		*Level*							*Unrealized*				*Unrealized*
		*(1)*			*Fair Value*				*Holding Gains*				*Holding Losses*				*Adjusted Cost*
Cash and Cash Equivalents
Cash					$	149,015			$	—			$	—			$	149,015
Money Market Funds		1				20,488,030				—				—			$	20,488,030
Subtotal						20,637,045				—				—				20,637,045
Short-Term Investment Securities⁽²⁾
Corporate Bonds ⁽³⁾		2				8,473,461				22,473				(6,463	)		$	8,457,451
Total					$	29,110,506			$	22,473			$	(6,463	)		$	29,094,496