Note 2 - Cash, Cash Equivalents, and Investments - Major Security Type (Details) - USD ($)	Mar. 31, 2023		Dec. 31, 2022
Cash and cash equivalent, fair value	$ 6,374,090		$ 5,794,272
Cash, adjusted cost	139,306		26,782
Money Market Funds, adjusted cost	6,234,784		5,767,490
Cash and cash equivalents	6,374,090		5,794,272
Corporate Bonds, allowance for credit loss	0		0
Corporate Bonds, gross unrealized holding gains	1,727		0
Corporate Bonds, gross unrealized holding losses	(24,118)		(47,208)
Total, fair value	11,714,334		12,594,334
Total, adjusted	11,736,725		12,641,542
Cash [Member]
Cash and cash equivalent, fair value	139,306		26,782
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member]
Cash and cash equivalent, fair value	6,234,784	[1]	5,767,490
Short-term Corporate Bonds [Member]
Corporate Bonds, adjusted cost	5,362,635		6,847,270
Short-term Corporate Bonds [Member] | Fair Value, Inputs, Level 2 [Member]
Corporate Bonds, fair value	5,340,244	[2],[3],[4]	6,800,062
Corporate Bonds, allowance for credit loss	0	[2],[3],[4]	0
Corporate Bonds, gross unrealized holding gains	1,727	[2],[3],[4]	0
Corporate Bonds, gross unrealized holding losses	$ (24,118)		$ (47,208)

[1] All of our money market funds were invested in U.S. Government money market funds.

[2] For the three months ended March 31, 2023 and 2022, the Company received discounts of $15,233 and paid premiums of $20,850 to purchase held-to-maturity investment securities, respectively. For the year ended December 31, 2022 the Company received discounts of $6,280 to purchase held-to-maturity investment securities.

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

[4] The Company considers the declines in market value of its investment portfolio to be temporary in nature. As of March 31, 2023 and December 31, 2022, the Company did not consider any of its investments to be other-than-temporarily impaired and no allowance for credit losses was recorded.