Note 7 - Goodwill and Other Acquired Intangible Assets, Net - Schedule of Other Intangible Assets (Details) - Real Estate segment - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Original Acquired Amount	$ 52,778	$ 52,928
Other Intangible Assets, Accumulated Amortization and Impairment	(37,312)	(34,543)
Other Intangible Assets, Net Carrying Amount	15,466	18,385
Client relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Original Acquired Amount	43,550	43,550
Other Intangible Assets, Accumulated Amortization and Impairment	(29,748)	(27,269)
Other Intangible Assets, Net Carrying Amount	13,802	16,281
Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Original Acquired Amount	8,285	8,435
Other Intangible Assets, Accumulated Amortization and Impairment	(6,988)	(6,789)
Other Intangible Assets, Net Carrying Amount	1,297	1,646
Trade name and trademarks
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Original Acquired Amount	480	480
Other Intangible Assets, Accumulated Amortization and Impairment	(461)	(404)
Other Intangible Assets, Net Carrying Amount	19	76
Licenses
Acquired Finite-Lived Intangible Assets [Line Items]
Other Intangible Assets, Original Acquired Amount	463	463
Other Intangible Assets, Accumulated Amortization and Impairment	(115)	(81)
Other Intangible Assets, Net Carrying Amount	$ 348	$ 382