Note 1 - Summary of Significant Accounting Policies - Other Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2019	Dec. 31, 2018
Gross carrying amount	$ 2,258	$ 2,233
Accumulated amortization	819	710
Other Intangible Assets, Net	$ 1,439	$ 1,523	[1]
Customer Relationships [Member]
Remaining lives (Year)	9 years	9 years
Gross carrying amount	$ 1,302	$ 1,302
Accumulated amortization	578	506
Other Intangible Assets, Net	$ 724	$ 796
Trade Names [Member]
Remaining lives (Year)	3 years	20 years
Gross carrying amount	$ 100	$ 814
Accumulated amortization	78	143
Other Intangible Assets, Net	$ 22	$ 671
Intellectual Property [Member]
Remaining lives (Year)	20 years	3 years
Gross carrying amount	$ 814	$ 100
Accumulated amortization	163	61
Other Intangible Assets, Net	$ 651	$ 39
Patents [Member]
Remaining lives (Year)	7 years	7 years
Gross carrying amount	$ 42	$ 17
Accumulated amortization
Other Intangible Assets, Net	$ 42	$ 17

[1] The balance sheet at December 31, 2018 has been derived from the audited financial statements at that date.