Note 3 - Business Combinations (Details Textual) - USD ($) $ in Thousands		3 Months Ended		9 Months Ended		18 Months Ended
	May. 01, 2015	Dec. 31, 2015	Jun. 30, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2015
RadioPulse [Member]
Payments to Acquire Businesses, Gross	$ 14,700
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	$ 6,000
Business Combination, Contingent Consideration Arrangements, Earnout Payment Period	3 years
Business Acquisition, Transaction Costs	$ 248
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards	$ 249			$ 249
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		$ 1,000		3,200
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (879)		(2,600)
Other Acquisition [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 2,300
Cash Acquired from Acquisition			204
Goodwill, Acquired During Period			2,800
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 723
Goodwill, Translation Adjustments						$ (559)
Payments to Acquire Businesses, Net of Cash Acquired				$ 14,571	$ 2,297