Note 9 - Segment Information - Segment Reporting Information (Details) - USD ($) $ in Thousands	3 Months Ended						9 Months Ended
	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2019	Sep. 30, 2018
Net revenues	$ 66,440			$ 58,388			$ 191,823	$ 172,191
Operating income (loss)	3,047			2,324			9,007	1,817
Interest expense	216			333			605	886
Other income, net	(11)			(109)			(268)	(413)
Income before income tax expense	2,842			2,100			8,670	1,344
Income tax expense	760			419			2,745	335
Net income	2,082	$ 2,807	$ 1,037	1,681	$ (1,097)	$ 425	5,925	1,009
Net income (loss) attributable to non-controlling interest	(1,175)			(1,060)			(2,880)	(2,027)
Net income (loss), parent	907			621			3,045	(1,018)
Depreciation and amortization	524			522			1,563	1,595
Capital expenditures	443			389			1,378	1,340
US Segment [Member]
Net revenues	26,480			22,412			73,142	62,338
Operating income (loss)	1,273			1,085			4,633	(1,135)
Interest expense	130			68			377	130
Other income, net	(1)						(2)
Income before income tax expense	1,144			1,017			4,258	(1,265)
Income tax expense	217			255			918	(191)
Net income	927			762			3,340	(1,074)
Net income (loss) attributable to non-controlling interest	(380)			(496)			(1,155)	(654)
Net income (loss), parent	547			266			2,185	(1,728)
Depreciation and amortization	390			358			1,144	1,079
Capital expenditures	418			293			1,140	1,200
International Segment [Member]
Net revenues	39,960			35,976			118,681	109,853
Operating income (loss)	1,774			1,239			4,374	2,952
Interest expense	86			265			228	756
Other income, net	(10)			(109)			(266)	(413)
Income before income tax expense	1,698			1,083			4,412	2,609
Income tax expense	543			164			1,827	526
Net income	1,155			919			2,585	2,083
Net income (loss) attributable to non-controlling interest	(795)			(564)			(1,725)	(1,373)
Net income (loss), parent	360			355			860	710
Depreciation and amortization	134			164			419	516
Capital expenditures	$ 25			$ 96			$ 238	$ 140