Note 5 - Other Comprehensive Income - Accumulated Other Comprehensive Loss Balances (Details)	3 Months Ended
	Mar. 31, 2018 USD ($)
Balance	$ 10,444,260
Balance	10,450,408
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Balance	(5,365,364)
Accumulated Other Comprehensive Loss, Current period change	433,065
Balance	(4,932,299)
AOCI Attributable to Parent [Member]
Balance	(5,365,364)
Accumulated Other Comprehensive Loss, Current period change	433,065
Balance	$ (4,932,299)