Note 7 - Summary of Operations by Quarter (Details) - USD ($)	3 Months Ended
	Sep. 30, 2015		Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013
Revenues	$ 10,760,000		$ 10,503,000	$ 11,392,000	$ 11,323,000	$ 11,497,000	$ 11,147,000	$ 10,828,000	$ 9,951,000
Costs and expenses	11,812,000		11,636,000	12,358,000	11,684,000	11,637,000	11,410,000	11,346,000	11,220,000
Income (Loss) from operations	(1,052,000)		(1,133,000)	(966,000)	(361,000)	(140,000)	(263,000)	(518,000)	(1,269,000)
Other income, net	532,000	[1]	1,106,000	795,000	769,000	845,000	276,000	591,000	619,000
Income (loss) before taxes	(520,000)		(27,000)	(171,000)	408,000	705,000	13,000	73,000	(650,000)
Benefits from income taxes	360,000		60,000	675,000	25,000	475,000	25,000	(20,000)	10,000
Net income	$ (160,000)		$ 33,000	$ 504,000	$ 433,000	$ 1,180,000	$ 38,000	$ 53,000	$ (640,000)
Basic and diluted net income per share (in dollars per share)	$ (0.11)		$ 0.02	$ 0.37	$ 0.31	$ 0.85	$ 0.03	$ 0.04	$ (0.46)

[1] Includes other-than-temporary impairment losses on investments of $376,000.