Note 8 - Restructuring - Accrued Restructuring Costs (Details) - USD ($)	6 Months Ended
	Jun. 30, 2015
Facility Closing [Member]
Balance at December 31, 2014	$ 42,000
(Credit) charge for restructuring	0
Payments	(42,000)
Balance at June 30, 2015	0
Employee Relocation [Member]
Balance at December 31, 2014	28,000
(Credit) charge for restructuring	(9,000)
Payments	(19,000)
Balance at June 30, 2015	0
Employee Severance [Member]
Balance at December 31, 2014	0
(Credit) charge for restructuring	3,000
Payments	(3,000)
Balance at June 30, 2015	0
Balance at December 31, 2014	70,000
(Credit) charge for restructuring	(6,000)
Payments	(64,000)
Balance at June 30, 2015	$ 0