Note 5 - Fair Value of Financial Instruments - Assets Measured at Fair Value on Recurring Basis (Details) - USD ($)	Mar. 31, 2022	Dec. 31, 2021
Fair Value	$ 22,680,303	$ 0
Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value	19,676,153
US Treasury Securities [Member]
Fair Value	3,004,150
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	5,046,607
Fair Value	0
Total financial assets	5,046,607
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value	0
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Fair Value	0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	3,499,545
Fair Value	22,680,303
Total financial assets	26,179,848
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value	19,676,153
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Fair Value	3,004,150
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	0
Fair Value	0
Total financial assets	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | Commercial Paper, Not Included with Cash and Cash Equivalents [Member]
Fair Value	0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member] | US Treasury Securities [Member]
Fair Value	0
Money Market Funds [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	5,046,607
Money Market Funds [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	0
Money Market Funds [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	0
Commercial Paper [Member] | Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	0
Commercial Paper [Member] | Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	3,499,545
Commercial Paper [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Cash and cash equivalents	$ 0