Note 8 - Long-term Debt (Details) (Parentheticals) - USD ($)	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Five Year Term Loan [Member]
Debt Instrument, Face Amount	$ 2,100,000	$ 2,100,000
Debt Instrument, Term	5 years	5 years
Debt Instrument, Periodic Payment	$ 35,000	$ 35,000
Debt Instrument, Interest Rate, Stated Percentage	3.045%	3.045%
Collateral	$ 200,000	$ 400,000
Collateral release amount per year	200,000	200,000
Collateral released	800,000	600,000
Initial Collateral	$ 1,000,000	$ 1,000,000
HSBC Bank Mortgage Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.75%	1.75%
HSBC Bank Mortgage Loan [Member] | Prime Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%	0.50%
HSBC Bank Mortgage Loan [Member]
Debt Instrument, Face Amount	$ 6,000,000	$ 6,000,000
Debt Instrument, Periodic Payment	$ 25,000	$ 25,000