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Note 7 - Results of Operations by Quarter (Unaudited) - Summary of Operations by Quarter (Details) - USD ($)
 3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Revenue from Contract with Customer, Including Assessed Tax $ 10,106,000 $ 11,007,000 $ 9,338,000 $ 10,252,000 $ 10,914,000 $ 10,201,000 $ 10,279,000 $ 9,990,000 $ 40,703,000 $ 41,384,000 $ 41,612,000
Costs and expenses 13,639,000 13,716,000 13,711,000 13,697,000 14,329,000 13,834,000 13,545,000 12,843,000      
Loss from operations (3,533,000) (2,709,000) (4,373,000) (3,445,000) (3,415,000) (3,633,000) (3,266,000) (2,853,000)      
Other income, net 879,000 1,027,000 4,041,000 1,334,000 1,205,000 [1] 817,000 2,005,000 1,072,000      
Other-than-temporary impairment losses on investments (4,560,000)         (4,560,000) 0
Loss before taxes (7,214,000) (1,682,000) (332,000) (2,111,000)         (11,339,000) (8,068,000) (2,978,000)
Benefit from income taxes 1,880,000 710,000 100,000 16,850,000 1,135,000 1,465,000 4,240,000 310,000 19,540,000 7,150,000 1,935,000
Net income (loss) $ (5,334,000) $ (972,000) $ (232,000) $ 14,739,000 $ (1,075,000) $ (1,351,000) $ 2,979,000 $ (1,471,000) $ 8,201,000 $ (918,000) $ (1,043,000)
Basic and diluted net (loss) income per share (in dollars per share) $ (3.86) $ (0.70) $ (0.17) $ 10.67 $ (0.77) $ (0.98) $ 2.16 $ (1.07) $ 5.94 $ (0.66) $ (0.76)
Income (loss) before taxes         $ (2,210,000) $ (2,816,000) $ (1,261,000) $ (1,781,000) $ (11,339,000) $ (8,068,000) $ (2,978,000)
[1] Includes other-than-temporary impairment losses on investments of $376,000