Note 13 - Preferred Stock and Common Stock (Details Textual) - $ / shares $ / shares in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2015
Preferred Stock, No Par Value	$ 0	$ 0
Preferred Stock, Shares Authorized	1,000,000	1,000,000
Preferred Stock, Shares Issued, Total	0	0
Common Stock, Shares Authorized	40,000,000	40,000,000	20,000,000