Note 18 - Reportable Segments (Details) - Jun. 30, 2015	Total	Total
Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Display Technologies [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Customers Individually Accounting for 10% or More of Each Segment's Sales	3	3
Concentration Risk, Percentage	61.00%	61.00%
Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Optical Communications [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Customers Individually Accounting for 10% or More of Each Segment's Sales	2	1
Concentration Risk, Percentage	22.00%	11.00%
Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Environmental Technologies [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Customers Individually Accounting for 10% or More of Each Segment's Sales	3	3
Concentration Risk, Percentage	87.00%	86.00%
Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Specialty Materials [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Customers Individually Accounting for 10% or More of Each Segment's Sales	3	3
Concentration Risk, Percentage	53.00%	56.00%
Sales Revenue, Segment [Member] | Customer Concentration Risk [Member] | Life Sciences [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Customers Individually Accounting for 10% or More of Each Segment's Sales	2	2
Concentration Risk, Percentage	48.00%	46.00%
Minimum [Member]
Note 18 - Reportable Segments (Details) [Line Items]
Number of Material Formulations		150