Note 18 - Income Taxes - Foreign Subsidiaries Income Tax Years Open to Examination (Details)	12 Months Ended
	Dec. 31, 2018
Earliest Tax Year [Member] | ISRAEL
Countries	2015
Earliest Tax Year [Member] | KENYA
Countries	2012
Earliest Tax Year [Member] | GUATEMALA
Countries	2014
Earliest Tax Year [Member] | HONDURAS
Countries	2014
Earliest Tax Year [Member] | GUADELOUPE
Countries	2016
Earliest Tax Year [Member] | NEW ZEALAND
Countries	2012
Latest Tax Year [Member] | ISRAEL
Countries	2018
Latest Tax Year [Member] | KENYA
Countries	2018
Latest Tax Year [Member] | GUATEMALA
Countries	2018
Latest Tax Year [Member] | HONDURAS
Countries	2018
Latest Tax Year [Member] | GUADELOUPE
Countries	2018
Latest Tax Year [Member] | NEW ZEALAND
Countries	2018