Note 2 - Significant Accounting Policies (Tables)

3 Months Ended

Mar. 31, 2015

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,
2015	$	32,600	$	—	$	—	$	(9,700	)	$	22,900
2014	$	42,000	$	—	$	—	$	(18,900	)	$	23,100

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

	Three Months Ended March 31, 2015			As of March 31, 2015			Three Months Ended March 31, 2014			As of March 31, 2014
Customer	Sales			Accounts Receivable			Sales			Accounts Receivable
Alcatel-Lucent		-			-			8.0	%		26.0	%
Centric		1.7	%		3.1	%		6.0	%		9.0	%
Elosoft		10.1	%		0.6	%		6.0	%		9.0	%
Ericsson		-			0.2	%		4.1	%		8.0	%
GE		1.9	%		2.3	%		13.0	%		22.0	%
IDS		5.8	%		-			8.0	%		-
Raytheon		13.4	%		23.0	%		0.5	%		-
Uniface		18.8	%		40.9	%		3.0	%		3.4	%
Total		51.7	%		70.1	%		48.6	%		77.4	%