Note 2 - Fair Value of Financial Instruments - Financial Instruments (Details) - USD ($)	Mar. 31, 2023	Dec. 31, 2022
Reported Value Measurement [Member]
Total	$ 8,205,336	$ 8,152,810
Estimate of Fair Value Measurement [Member]
Total	8,189,771	8,148,126
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Cash and Cash Equivalents Excluding Certificates of Deposit [Member]
Cash and cash equivalents	7,190,450	7,148,207
Fair Value, Inputs, Level 2 [Member] | Reported Value Measurement [Member] | Certificates of Deposit [Member]
Cash and cash equivalents	1,014,886	1,004,603
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Cash and Cash Equivalents Excluding Certificates of Deposit [Member]
Cash and cash equivalents	7,190,450	7,148,207
Fair Value, Inputs, Level 2 [Member] | Estimate of Fair Value Measurement [Member] | Certificates of Deposit [Member]
Cash and cash equivalents	$ 999,321	$ 999,919