Note 6 - Derivative Instruments (Details Textual) $ in Millions	Sep. 30, 2018 USD ($)
Interest Rate Swap [Member]
Derivative, Notional Amount	$ 100
Foreign Exchange Forward [Member]
Derivative, Notional Amount	$ 52
Derivative, Percentage of Expected Inter-company Sales Between European and US Subsidiary	70.00%

Aggregate notional amount specified by the derivative(s). Expressed as an absolute value.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

Name:	invest_DerivativeNotionalAmount
Namespace Prefix:	invest_
Data Type:	xbrli:monetaryItemType
Balance Type:	na
Period Type:	instant