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Note 13 - Convertible Notes (Details Textual)			12 Months Ended
	Dec. 07, 2021 $ / shares	May 19, 2020 USD ($) $ / shares	Dec. 31, 2021 USD ($)
Dividends Payable, Amount Per Share (in dollars per share) | $ / shares	$ 0.15	$ 0.05
Convertible Senior Subordinated Notes [Member] | Convertible Subordinated Debt [Member]
Debt Instrument, Face Amount		$ 230,000
Debt Instrument, Interest Rate, Stated Percentage		4.00%
Debt Instrument, Convertible, Conversion Ratio	17.2624	17.2507
Debt Instrument, Convertible, Conversion Price (in dollars per share) | $ / shares	$ 57.93	$ 57.97
Debt Instrument, Redemption Price, Percentage		100.00%
Debt Instrument, Convertible, Threshold Percentage of Stock Price Trigger		130.00%
Debt Issuance Costs, Net, Total		$ 6,795,000
Debt Instrument, Convertible, Remaining Discount Amortization Period (Year)		5 years
Amortization of Debt Issuance Costs			$ 1,257,000
Debt Instrument, Interest Rate, Effective Percentage			4.70%

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