Number of shares that have been repurchased and retired during the period.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:sharesItemType
Balance Type:	na
Period Type:	duration

Note 15 - Stockholders' Equity (Details Textual) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Feb. 14, 2019	Feb. 14, 2018	Mar. 01, 2017
Stock Buyback Program 2019 [Member]
Stock Repurchase Program, Authorized Amount					$ 40
Stock Repurchased and Retired During Period, Shares	0		0
Stock Buyback Program 2018 [Member]
Stock Repurchase Program, Authorized Amount						$ 40
Stock Repurchased and Retired During Period, Shares		0	0	0
Stock Buyback Program 2017 [Member]
Stock Repurchase Program, Authorized Amount							$ 40
Stock Repurchased and Retired During Period, Shares				0