Note 8 - Note Receivable (Details Textual) - USD ($)	6 Months Ended
	Jun. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Financing Receivable, after Allowance for Credit Loss, Current, Total	$ 0	$ 295,000	$ 295,000
Receivable with Imputed Interest, Effective Yield (Interest Rate)	5.00%