Note 1 - Description of Business and Significant Accounting Policies (Details Textual) - USD ($)	6 Months Ended		12 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2022	Dec. 31, 2021
Cash Equivalents, at Carrying Value, Total			$ 31,452,000	$ 2,478,000
Marketable Securities, Realized Gain (Loss)			$ 0
Percentage of Concentration Risk Credit Risk Financial Instruments Under Option One			5.00%
Concentration Risk Credit Risk Financial Instruments Under Option Two			$ 1,000,000
Percentage of Credit Exposure Limits Based on Cash and Cash Equivalents and Marketable Securities			40.00%
Credit Exposure Limits of Cash and Cash Equivalents and Marketable Securities Under Option Two			$ 15,000,000
Goodwill, Impairment Loss	$ 0	$ 0
Cash, Cash Equivalents, and Short-Term Investments, Total			$ 52,542