Note 12 - Debt (Details Textual)	1 Months Ended	12 Months Ended
	Nov. 22, 2011 USD ($) Rate	Jun. 30, 2015 USD ($)
Amended Agreement [Member] | Maximum [Member]
Current Funded Debt to EBITDA Ratio		2.25
Standby Letters of Credit [Member]
Long-term Line of Credit		$ 800,000
Maximum [Member]
Annual Capital Expenditures		$ 15,000,000
Minimum [Member]
Debt Service Coverage Rate		1.25
London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate		1.50%
Term Loan [Member]
Debt Instrument, Face Amount	$ 15,500,000
Debt Instrument, Term	10 years
Debt Instrument, Interest Rate, Stated Percentage | Rate	4.50%
Line of Credit Facility, Periodic Payment	$ 160,640
Long-term Line of Credit		$ 10,700,000
Line of Credit Facility, Maximum Borrowing Capacity		$ 23,000,000
Line of Credit Facility, Interest Rate During Period		2.03%
Minimum Consolidated Cash and Liquid Investments Pursuant to New Loan and Security Agreement		$ 10,000,000
Long-term Line of Credit		$ 9,300,000
Line of Credit Facility, Commitment Fee Percentage		0.25%
Line of Credit Facility, Current Borrowing Capacity		$ 22,200,000
Line of Credit Facility, Remaining Borrowing Capacity		$ 12,900,000