Note 3 - Business Combinations (Details Textual) - USD ($)		3 Months Ended		6 Months Ended		15 Months Ended
	May. 01, 2015	Sep. 30, 2015	Jun. 30, 2014	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015
RadioPulse [Member]
Payments to Acquire Businesses, Gross	$ 14,700,000
Business Combination, Contingent Consideration Arrangements, Range of Outcomes, Value, High	6,000,000
Business Acquisition, Transaction Costs	248,000
Employee Service Share-based Compensation, Cash Flow Effect, Cash Used to Settle Awards	$ 249,000			$ 249,000
Goodwill, Purchase Accounting Adjustments		$ (190,000)
Increase (Decrease) in Fair Value of Accounts Receivable Acquired		471,000
Increase (Decrease) in Fair Value of Accrued and Other Liabilities Acquired		283,000
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		930,000		2,200,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		$ (1,200,000)		(2,400,000)
Other Acquisition [Member]
Payments to Acquire Businesses, Net of Cash Acquired			$ 2,300,000
Cash Acquired from Acquisition			204,000
Goodwill, Acquired During Period			2,800,000
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Long-term Debt			$ 723,000
Goodwill, Translation Adjustments						$ (490,000)
Payments to Acquire Businesses, Net of Cash Acquired				$ 14,571,000	$ 2,297,000