Note 3 - Significant Accounting Policies - Disaggregated Revenue Streams (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
TOTAL REVENUES	$ 116,165	$ 109,997	$ 103,952
Percent of Rental Income	100.00%	100.00%	100.00%
Leases [Member]
TOTAL REVENUES	$ 110,692	$ 104,688	$ 98,839
Percent of Rental Income	95.30%	95.20%	95.10%
Other Expense Recoveries [Member]
TOTAL REVENUES	$ 3,732	$ 3,411	$ 3,734
Percent of Rental Income	3.20%	3.10%	3.60%
Other Revenue Stream [Member]
TOTAL REVENUES	$ 1,741	$ 1,898	$ 1,379
Percent of Rental Income	1.50%	1.70%	1.30%
Residential Segment [Member]
TOTAL REVENUES	$ 87,386	$ 81,117	$ 74,859
Residential Segment [Member] | Leases [Member]
TOTAL REVENUES	85,751	79,366	73,667
Residential Segment [Member] | Other Expense Recoveries [Member]
TOTAL REVENUES	521	523	243
Residential Segment [Member] | Other Revenue Stream [Member]
TOTAL REVENUES	1,114	1,228	949
Commercial Segment [Member]
TOTAL REVENUES	28,779	28,880	29,093
Commercial Segment [Member] | Leases [Member]
TOTAL REVENUES	24,941	25,322	25,172
Commercial Segment [Member] | Other Expense Recoveries [Member]
TOTAL REVENUES	3,211	2,888	3,491
Commercial Segment [Member] | Other Revenue Stream [Member]
TOTAL REVENUES	$ 627	$ 670	$ 430