Note 2 - Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Allowance for Credit Losses on Financing Receivables [Table Text Block]

	Beginning Balance		Charge Offs		Recoveries		Provision			Ending Balance
Three Months Ended March 31,
2014	$	42,000	$	—	$	—	$	(18,900	)	$	23,100
2013		33,900		—		—		(18,300	)		15,600

Schedules of Concentration of Risk, by Risk Factor [Table Text Block]

	Three Months Ended March 31, 2014			As of March 31,  2014			Three Months Ended March 31, 2013			As of March 31, 2013
Customer	Sales			Accounts Receivable			Sales			Accounts Receivable
Alcatel-Lucent		8.0	%		26.0	%		10.0	%		21.8	%
Centric		6.0	%		9.0	%		3.9	%		0.0	%
Elosoft		6.0	%		9.0	%		6.5	%		10.8	%
Ericsson		4.1	%		8.0	%		12.8	%		27.8	%
GE		13.0	%		22.0	%		2.2	%		0.0	%
IDS		8.0	%		0.0	%		8.4	%		0.0	%
Total		45.1	%		74.0	%		43.8	%		60.4	%