Note 2 - Significant Accounting Policies (Tables)

6 Months Ended

Jun. 30, 2015

Accounting Policies [Abstract]

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

	Beginning Balance		Charge Offs		Recoveries		Provision			Ending Balance
2015	$	22,900	$	—	$	—	$	(7,000	)	$	15,900
2014		23,100		—		—		(2,700	)		20,400

	Beginning Balance		Charge Offs		Recoveries		Provision			Ending Balance
2015	$	32,600	$	—	$	—	$	(16,700	)	$	15,900
2014		42,000		—		—		(21,600	)		20,400

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

	Three Months Ended June 30, 2015			As of June 30, 2015			Three Months Ended June 30, 2014			As of June 30, 2014
Customer	Sales			Accounts Receivable			Sales			Accounts Receivable
Alcatel-Lucent		7.6	%		22.3	%		0.4	%		15.0	%
Centric		5.3	%		4.0	%		8.6	%		8.2	%
Elosoft		15.6	%		1.5	%		7.5	%		10.2	%
Ericsson		0.0	%		0.0	%		8.5	%		16.4	%
G E		1.4	%		4.2	%		12.1	%		23.1	%
Raytheon		19.4	%		28.8	%		1.1	%		0.0	%
Thermo LabSystems		2.2	%		3.6	%		5.0	%		8.6	%
Total		51.5	%		64.4	%		43.2	%		81.5	%

	Six Months Ended June 30, 2015			As of June 30, 2015			Six Months Ended June 30, 2014			As of June 30, 2014
Customer	Sales			Accounts Receivable			Sales			Accounts Receivable
Alcatel-Lucent		4.1	%		22.3	%		4.0	%		15.0	%
Centric		3.6	%		4.0	%		7.1	%		8.2	%
Elosoft		13.1	%		1.5	%		6.9	%		10.2	%
Ericsson		0.3	%		0.0	%		6.8	%		16.4	%
G E		1.6	%		4.2	%		12.5	%		23.1	%
IDS		3.3	%		0.0	%		5.6	%		0.0	%
Raytheon		16.6	%		28.8	%		0.0	%		0.0	%
Total		42.6	%		60.8	%		42.9	%		72.9	%