Note 16 - Concentration of Risk (Details Textual) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Available-for-sale, Realized Loss		$ 62,000
Accounts Receivable [Member] | Customer Concentration Risk [Member]
Concentration Risk Threshold Percentage	10.00%	10.00%
Revenue Benchmark [Member] | Customer Concentration Risk [Member]
Concentration Risk Threshold Percentage	10.00%	10.00%