Note 12 - Shareholders' Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands		12 Months Ended
	Jun. 13, 2019	Dec. 31, 2019	Dec. 31, 2018	May 13, 2019	Feb. 17, 2017
Treasury Stock, Value, Acquired, Cost Method		$ 9,134	$ 3,655
Tender Offer to Repurchase Shares for Cash, Number of Shares				3,000,000
Tender Offer to Repurchase Shares for Cash, Number of Shares, Percentage				14.20%
Share Repurchase Program [Member]
Stock Repurchase Program, Number of Shares Authorized to be Repurchased					1,000,000
Treasury Stock, Shares, Acquired		318,826
Treasury Stock Acquired, Average Cost Per Share		$ 4.09
Treasury Stock, Value, Acquired, Cost Method		$ 1,300
Tender Offer [Member]
Treasury Stock, Shares, Acquired	1,816,732
Treasury Stock Acquired, Average Cost Per Share	$ 3.95
Treasury Stock, Value, Acquired, Cost Method	$ 7,200