Note 23 - Shareholders' Equity (Details Textual)	Aug. 10, 2021 USD ($) shares	Feb. 26, 2021 USD ($) shares	May 24, 2019 shares	Dec. 31, 2021 $ / shares shares	Dec. 31, 2020 $ / shares shares	Dec. 31, 2019 $ / shares shares	Nov. 15, 2016 shares
Shareholders Equity [Line Items]
Stock Authorized				560,000,000
Common Stock, Shares Authorized				500,000,000
Common Stock, Par or Stated Value Per Share | $ / shares				$ 0.01	$ 0.01
Preferred Stock, Shares Authorized				60,000,000	60,000,000	60,000,000
Preferred Stock, No Par Value | $ / shares				$ 0	$ 0	$ 0
Common Stock, Shares, Outstanding				78,700,000	77,200,000
Preferred Stock, Shares Outstanding				2,000,000	2,000,000	2,000,000
Preferred Stock, Shares Issued				2,000,000	2,000,000	2,000,000
Treasury Stock, Shares				800,000	700,000
Registration Rights Agreement [Member]
Shareholders Equity [Line Items]
Purchase agreement date		Feb. 26, 2021	May 24, 2019
Registration Rights Agreement [Member] | 5.00% Secured Convertible Notes Due 2021 [Member]
Shareholders Equity [Line Items]
Common stock issuable upon conversion			31,497,850
Debt instrument interest rate			5.00%
Registration Rights Agreement [Member] | 5.0% Unsecured Convertible Promissory Notes Due May 28, 2026 [Member]
Shareholders Equity [Line Items]
Common stock issuable upon conversion		1,000,000
Debt instrument interest rate		5.00%
Principal amount convertible note | $		$ 25,000,000
Maximum [Member]
Shareholders Equity [Line Items]
Number of shares registered for resale through registration statements	44,490,032
Securities registered for offer and sale through registration statements | $	$ 500,000,000
Series B Preferred Stock [Member]
Shareholders Equity [Line Items]
Preferred Stock, Shares Outstanding				1,000,000.0
Preferred Stock, Shares Issued				1,000,000.0
Series C Preferred Stock [Member]
Shareholders Equity [Line Items]
Preferred Stock, Shares Outstanding				1,000,000.0
Preferred Stock, Shares Issued				1,000,000.0
Series C Preferred Stock [Member] | Registration Rights Agreement [Member]
Shareholders Equity [Line Items]
Initial conversion rate of preferred stock to common stock		1,000,000
Series A Preferred Stock
Shareholders Equity [Line Items]
Preferred Stock, Shares Outstanding					2,000,000.0
Preferred Stock, Shares Issued					2,000,000.0
Series A Preferred Stock | Registration Rights Agreement [Member]
Shareholders Equity [Line Items]
Purchase agreement date		Feb. 26, 2021
Initial conversion rate of preferred stock to common stock							1,000,000