Note 1 - Basis of Presentation and Certain Significant Accounting Policies (Details Textual)	1 Months Ended	3 Months Ended		12 Months Ended
	Mar. 31, 2019 USD ($)	Mar. 31, 2019 USD ($)	Mar. 31, 2018 USD ($)	Dec. 31, 2018 USD ($)	Jan. 01, 2019 USD ($)	Jan. 01, 2018 USD ($)	Dec. 31, 2017 USD ($)
Number of Operating Segments		1		2
Number of Reportable Segments		1
Goodwill, Impairment Loss		$ 0
Goodwill, Foreign Currency Translation Gain (Loss)		2,180	$ 2,596
Contract with Customer, Estimate of Sales Return	$ 184,000	184,000
Contract with Customer, Estimate of Merchandise Expected to Be Returned	111,000	111,000
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (397,110)			$ (168,311)
Payments to Acquire Short-term Investments	5,000,000	4,999,750
Operating Lease, Right-of-Use Asset	6,389,561	6,389,561
Accounts Payable and Accrued Liabilities [Member]
Contract with Customer, Liability, Total	$ 119,492	$ 119,492
Accounting Standards Update 2016-02 [Member]
Operating Lease, Right-of-Use Asset					$ 6,100,000
Operating Lease, Liability, Total					$ 6,500,000
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption				$ (397,110)			$ (168,311)
Retained Earnings [Member] | Accounting Standards Update 2014-09 [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption						$ (168,311)
SPAIN
Number of Stores					1