Note 10 - Equity (Details Textual) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended	12 Months Ended
	Sep. 30, 2021	Jun. 30, 2021	Sep. 30, 2021	Dec. 31, 2020	May 31, 2021	Jul. 31, 2015
Treasury Stock, Value, Acquired, Cost Method	$ 51	$ 1,588
Share Repurchase Program Authorized in July 2015 [Member]
Stock Repurchase Program, Authorized Amount						$ 25,000
Treasury Stock, Shares, Acquired (in shares)			0	0
Share Repurchase Program Authorized in May 2021 [Member]
Stock Repurchase Program, Authorized Amount					$ 6,000
Treasury Stock, Shares, Acquired (in shares)			236,159
Treasury Stock, Value, Acquired, Cost Method			$ 1,600
Treasury Stock Acquired, Average Cost Per Share (in dollars per share)			$ 6.94