Note 15 - Stockholders' Equity (Details Textual)	12 Months Ended
	Dec. 31, 2018 $ / shares shares	Dec. 31, 2017 $ / shares shares	Dec. 31, 2016 shares
Common Stock, Shares Authorized	200,000,000	200,000,000
Common Stock, Par or Stated Value Per Share | $ / shares	$ 0.01	$ 0.01
Common Stock, Shares, Issued, Total	20,153,269	19,919,529
Common Stock, Shares, Outstanding, Ending Balance	20,152,029	19,918,289
Common Stock, Voting Rights Number	1	1
Restricted Stock [Member]
Shares, Outstanding, Ending Balance		385,716
Common Stock [Member]
Shares, Outstanding, Ending Balance	20,152,029	19,532,573	18,669,927