Note 12 - Segment Reporting - Income From Operations by Segment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Total revenues	$ 116,165	$ 109,997	$ 103,952
Property operating expenses	28,887	27,267	27,029
Real estate taxes and insurance	24,966	22,293	20,685
General and administrative	9,167	9,873	9,944
Depreciation and amortization	19,649	18,005	16,721
Total operating expenses	82,669	77,539	74,448
Income from operations	33,496	32,458	29,504
Acquisition and other		101	69
Total Assets	1,166,207	1,101,008	1,052,085
Interest expense	35,187	32,781	35,505
Capital expenditures	42,623	45,642	22,725
Rental Income [Member]
Total revenues	116,165	109,997	103,952
Commercial Segment [Member]
Total revenues	28,779	28,880	29,093
Property operating expenses	4,354	4,312	4,328
Real estate taxes and insurance	5,465	4,687	4,438
General and administrative	1,355	1,078	801
Depreciation and amortization	3,905	3,642	3,277
Total operating expenses	15,079	13,719	12,844
Income from operations	13,700	15,161	16,249
Acquisition and other
Total Assets	285,103	245,940	222,288
Interest expense	7,241	6,987	7,569
Capital expenditures	6,038	2,460	4,187
Commercial Segment [Member] | Rental Income [Member]
Total revenues	28,779	28,880	29,093
Residential Segment [Member]
Total revenues	87,386	81,117	74,859
Property operating expenses	24,533	22,955	22,701
Real estate taxes and insurance	19,501	17,606	16,247
General and administrative	7,812	8,795	9,143
Depreciation and amortization	15,744	14,363	13,444
Total operating expenses	67,590	63,820	61,604
Income from operations	19,796	17,297	13,255
Acquisition and other		101	69
Total Assets	881,104	855,068	829,797
Interest expense	27,946	25,794	27,936
Capital expenditures	36,585	43,182	18,538
Residential Segment [Member] | Rental Income [Member]
Total revenues	$ 87,386	$ 81,117	$ 74,859