Note 16 - Stock Option Plans - Summary of Outstanding Options (Details) - $ / shares	3 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Dec. 31, 2015	Sep. 30, 2015
Options Outstanding, Number of Shares Outstanding (in shares)	897,167	949,667	1,110,666	1,043,566
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 109 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 8.14	$ 8.47	$ 8.43	$ 8.47
Options Exercisable, Number of Shares Exercisable (in shares)	844,829		965,325
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 8.15		$ 8.46
Range One [Member]
Range of Exercise Price, Lower (in dollars per share)	2.8751
Range of Exercise Price, Upper (in dollars per share)	$ 5.75
Options Outstanding, Number of Shares Outstanding (in shares)	3,800
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	2 years 109 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 2.95
Options Exercisable, Number of Shares Exercisable (in shares)	3,800
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 2.95
Range Two [Member]
Range of Exercise Price, Lower (in dollars per share)	5.7501
Range of Exercise Price, Upper (in dollars per share)	$ 8.625
Options Outstanding, Number of Shares Outstanding (in shares)	768,867
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	5 years 73 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 7.96
Options Exercisable, Number of Shares Exercisable (in shares)	716,529
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 7.96
Range Three [Member]
Range of Exercise Price, Lower (in dollars per share)	8.6251
Range of Exercise Price, Upper (in dollars per share)	$ 11.50
Options Outstanding, Number of Shares Outstanding (in shares)	124,500
Options Outstanding, Weighted Average Remaining Contractual Life (Year)	6 years 36 days
Options Outstanding, Weighted Average Exercise Price (in dollars per share)	$ 9.40
Options Exercisable, Number of Shares Exercisable (in shares)	124,500
Options Exercisable, Weighted Average Exercise Price (in dollars per share)	$ 9.40