Note 6 - Capital Stock, Treasury Stock, Contributed Capital and Stock Options: (Detail) (USD $)	3 Months Ended	6 Months Ended		15 Months Ended															6 Months Ended		3 Months Ended				6 Months Ended			3 Months Ended
	Mar. 31, 2013	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Common Class A [Member] 2013 Omnibus Equity Plan [Member]	Mar. 31, 2013 Common Class A [Member] Directors Plans [Member]	Dec. 31, 2012 Common Class A [Member] Minimum [Member]	Dec. 31, 2012 Common Class A [Member] Maximum [Member]	Mar. 31, 2013 Common Class A [Member]	Sep. 30, 2012 Common Class A [Member]	Mar. 31, 2012 Common Class A [Member]	Dec. 31, 2012 Common Class B [Member] Minimum [Member]	Dec. 31, 2012 Common Class B [Member] Maximum [Member]	Mar. 31, 2013 Common Class B [Member]	Dec. 31, 2012 Common Class B [Member]	Sep. 30, 2012 Common Class B [Member]	Mar. 31, 2012 Common Class B [Member]	Mar. 31, 2013 Employee Plans [Member]	Mar. 31, 2012 Employee Plans [Member]	Mar. 31, 2013 Directors Plans [Member]	Dec. 31, 2012 Directors Plans [Member]	Mar. 31, 2012 Directors Plans [Member]	Dec. 31, 2011 Directors Plans [Member]	Mar. 31, 2013 Directors Plans [Member]	Mar. 31, 2012 Directors Plans [Member]	Sep. 30, 2012 Directors Plans [Member]	Mar. 31, 2012 Expired Directors Plans [Member]
Common Stock, Capital Shares Reserved for Future Issuance						150,000										958,233
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Weighted Average Remaining Contractual Term																			10 years
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Lower Range Limit (in Dollars per share)		$ 2.925																	$ 3.55						$ 2.925			$ 2.925
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Number of Outstanding Options							31,000													26,850	31,000		42,000		31,000	42,000	33,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Upper Range Limit (in Dollars per share)																									$ 11.00
Share-based Compensation Arrangement by Share-based Payment Award, Options, Expirations in Period																					2,000							3,000
Share-based Compensation Arrangements by Share-based Payment Award, Options, Expirations in Period, Weighted Average Exercise Price (in Dollars per share)																					$ 3.67							$ 3.55
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross																												7,000
Share-based Compensation, Shares Authorized under Stock Option Plans, Exercise Price Range, Exercisable Options, Weighted Average Remaining Contractual Term																						3 years
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period																						3 years
Share-based Compensation (in Dollars)	$ 1,208	$ 4,049	$ 6,148	$ 3,283
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Risk Free Interest Rate																					5.00%		5.50%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Term																									10 years	10 years
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Dividend Rate																									0.00%	0.00%
Share-based Compensation Arrangement by Share-based Payment Award, Fair Value Assumptions, Expected Volatility Rate																						0.87%		0.75%
Common Stock, Shares Authorized					1,000,000			3,750,000	10,000,000	10,000,000	10,000,000	10,000,000	1,000,000	2,500,000	2,500,000		2,500,000	12,500,000