Note 9 - Notes Payable (Details)	1 Months Ended			1 Months Ended			1 Months Ended	9 Months Ended	1 Months Ended					3 Months Ended	9 Months Ended
	Nov. 30, 2012 USD ($)	Dec. 31, 2010 Ueno Trust [Member] Subordinated Unsecured Promissory Notes [Member] USD ($)	Dec. 31, 2010 Kuno and Ueno Trust [Member] Subordinated Unsecured Promissory Notes [Member] USD ($)	Nov. 30, 2010 Tokyo-Mitsubishi Bank [Member] Secured Debt [Member] JPY (¥)	Sep. 30, 2013 Tokyo-Mitsubishi Bank [Member] Secured Debt [Member] USD ($)	Dec. 31, 2012 Tokyo-Mitsubishi Bank [Member] Secured Debt [Member] USD ($)	Mar. 31, 2013 Mizuho Bank Limited [Member] Secured Debt [Member] JPY (¥)	Sep. 30, 2013 Mizuho Bank Limited [Member] Secured Debt [Member] USD ($)	May 31, 2013 Kuno and Ueno Trust [Member] Subordinated Unsecured Promissory Notes [Member] USD ($)	Nov. 30, 2011 Kuno and Ueno Trust [Member] Subordinated Unsecured Promissory Notes [Member] USD ($)	Nov. 30, 2010 TIBOR [Member]	Dec. 31, 2010 London Interbank Offered Rate (LIBOR) [Member] Subordinated Unsecured Promissory Notes [Member]	Dec. 31, 2010 Subordinated Unsecured Promissory Notes [Member]	Sep. 30, 2013 Subordinated Unsecured Promissory Notes [Member] USD ($)	Sep. 30, 2013 Subordinated Unsecured Promissory Notes [Member] USD ($)	Jun. 01, 2013 Subordinated Unsecured Promissory Notes [Member]
Note 9 - Notes Payable (Details) [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity (in Yen)				¥ 1,000,000,000			¥ 1,000,000,000
LineOfCreditFacilityPotentialTermExtensionPeriod				1 year			1 year
Debt Instrument, Basis Spread on Variable Rate							0.25%				1.00%	4.00%
Line of Credit Facility, Interest Rate at Period End					1.22%
Line of Credit Facility, Amount Outstanding					10,200,000	11,600,000		10,200,000
PercentageCollateralToLoans				90.00%				100.00%
Interest-bearing Deposits in Banks and Other Financial Institutions					14,900,000			11,000,000
Weighted Average Rate Domestic Deposit					0.25%			0.30%
Line of Credit Facility, Interest Rate Description							The loan bears annual interest based on the three-month TIBOR plus 0.25% and is reset quarterly.
Line of Credit Facility, Interest Rate During Period								0.47%
Debt Instrument, Face Amount		25,900,000	51,900,000
Debt Instrument, Interest Rate, Stated Percentage																4.40%
DebtInstrumentLengthOfAgreement													7 years
InterestRateEffectiveDate													Dec. 31, 2011
Repayments of Notes Payable	7,500,000								4,700,000	7,500,000
Interest Expense, Debt														$ 418,000	$ 1,300,000