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

12 Months Ended

Dec. 31, 2020

Notes Tables

Cash, Cash Equivalents and Investments [Table Text Block]

		*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 ⁽⁴⁾		2				8,473,461				22,473				(6,463	)		$	8,457,451
Total					$	29,110,506			$	22,473			$	(6,463	)		$	29,094,496

		*December 31, 2019*
									*Gross*				*Gross*
		*Level*							*Unrealized*				*Unrealized*
		*(1)*			*Fair Value*				*Holding Gains*				*Holding Losses*				*Adjusted Cost*
Cash and Cash Equivalents
Cash					$	1,010,510			$	—			$	—			$	1,010,510
Money Market Funds		1				3,813,034				—				—				3,813,034
Subtotal						4,823,544				—				—				4,823,544
Short-Term Investment Securities ⁽²⁾
Corporate Bonds ⁽⁴⁾		2				29,387,053				5,898				(17,991	)		$	29,399,146
Long-Term Investment Securities ⁽³⁾
Corporate Bonds ⁽⁴⁾		2				1,528,190				16,554				—				1,511,636
Total					$	35,738,787			$	22,452			$	(17,991	)		$	35,734,326