Note 1 - Summary of Significant Accounting Policies - Other Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2019	Dec. 31, 2018
Gross carrying amount	$ 2,271	$ 2,233
Accumulated amortization	874	710
Other Intangible Assets, Net	$ 1,397	$ 1,523	[1]
Customer Relationships [Member]
Remaining lives (Year)	9 years	9 years
Gross carrying amount	$ 1,302	$ 1,302
Accumulated amortization	615	506
Other Intangible Assets, Net	$ 687	$ 796
Intellectual Property [Member]
Remaining lives (Year)	3 years	3 years
Gross carrying amount	$ 100	$ 100
Accumulated amortization	86	61
Other Intangible Assets, Net	$ 14	$ 39
Trade Names [Member]
Remaining lives (Year)	20 years	20 years
Gross carrying amount	$ 814	$ 814
Accumulated amortization	173	143
Other Intangible Assets, Net	$ 641	$ 671
Patents [Member]
Remaining lives (Year)	7 years	7 years
Gross carrying amount	$ 55	$ 17
Accumulated amortization
Other Intangible Assets, Net	$ 55	$ 17

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