Note 11 - Income Taxes - Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended										12 Months Ended
	Dec. 31, 2017	[1],[2]	Sep. 30, 2017	[3]	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Current
Domestic -- Federal											$ 4,106	$ 1,295
Domestic -- state											175	74
Foreign											212	45
Total											4,493	1,414
Deferred
Domestic -- Federal											(1,886)	(39)
Domestic -- state											244	10
Foreign											12	164
Total											(1,630)	135
Income tax expense	$ 55		$ 823		$ 891	$ 1,094	$ 612	$ 631	$ 263	$ 43	$ 2,863	$ 1,549

[1] The quarter ended December 31, 2017 includes a $7,525 increase in the fair value of contingent consideration, which was not deductible for tax purposes.

[2] The quarter ended December 31, 2017 includes adjustments related to tax legislation enacted in December 2017, as discussed in Note 2 and 11.

[3] The quarter ended September 30, 2017 includes a $549 reduction in the fair value of contingent consideration, which was not taxable.