Long-Term Debt (Details 1) $ in Thousands	Jul. 31, 2018 USD ($)
1 Year or less	$ 243
2 Years	158
3 Years	1,075
4 Years	0
5 Years	0
After 5 Years	0
Total	1,476
USA
1 Year or less	158
2 Years	158
3 Years	1,075
4 Years	0
5 Years	0
After 5 Years	0
Total	1,391
Argentina
1 Year or less	85
2 Years	0
3 Years	0
4 Years	0
5 Years	0
After 5 Years	0
Total	$ 85