Note 8 - Goodwill and Intangible Assets - Acquired Intangible Assets (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Gross carrying amount	$ 680	$ 652
Accumulated amortization	593	591
Net carrying amount	$ 87	61
Minimum [Member]
Amortization period (Year)	5 years
Maximum [Member]
Amortization period (Year)	20 years
Other Intangible Assets [Member]
Gross carrying amount	$ 680	652
Accumulated amortization	593	591
Net carrying amount	$ 87	$ 61
Other Intangible Assets [Member] | Minimum [Member]
Amortization period (Year)	5 years	5 years
Other Intangible Assets [Member] | Maximum [Member]
Amortization period (Year)	10 years	10 years