Note 14 - Subsequent Event (Details Textual) - USD ($)	Oct. 28, 2015	Sep. 30, 2015
Maximum [Member] | Subsequent Event [Member] | Lancope, Inc. [Member]
Ownership Percentage in Investee	1.00%
Maximum [Member] | Subsequent Event [Member] | Cisco Acquiring Lancope, Inc. [Member]
Estimated Total Compensation for Sale of Interest	$ 2,500,000
Minimum [Member] | Subsequent Event [Member] | Cisco Acquiring Lancope, Inc. [Member]
Estimated Total Compensation for Sale of Interest	2,200,000
Subsequent Event [Member] | Cisco [Member] | Lancope, Inc. [Member]
Scheduled Payment to Acquire Business, Gross	$ 452,000,000
Business Acquisition, Scheduled Closing Period	90 days
Lancope, Inc. [Member]
Cost Method Investments		$ 214,000