Note 4 - Long-term Debt (Details Textual) - USD ($)		12 Months Ended
	Jun. 02, 2015	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Term Loan [Member]
Debt Instrument, Face Amount	$ 50,000,000
Loans Payable to Bank		$ 47,500,000
Debt Issuance Cost		1,000,000
Amount Drawn From Credit Agreement For Refinancing of Debt		50,000,000
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Revolving Credit Facility [Member]
Line of Credit Facility, Maximum Borrowing Capacity	$ 75,000,000
Long-term Line of Credit		8,000,000
Amount Drawn From Credit Agreement For Refinancing of Debt		$ 23,000,000
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Minimum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	1.50%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Minimum [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	0.50%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Maximum [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Basis Spread on Variable Rate	2.00%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Maximum [Member] | Base Rate [Member]
Debt Instrument, Basis Spread on Variable Rate	1.00%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument, Variable Rate		2.18%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member] | Base Rate [Member]
Debt Instrument, Variable Rate		4.25%
Credit Agreement [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member]
Debt Agreement Maximum Borrowing Capacity	$ 125,000,000
Debt Instrument Basis Spread On Federal Funds Rate	0.50%
Debt Instrument Basis Spread On Eurodollar Rate	1.00%
Term Loan [Member] | Fifth Third Bank, Bank of America, and Huntington National Bank [Member]
Debt Instrument, Term	5 years
Senior Secured Credit Facility [Member] | Bank of America [Member] | Debt Principal [Member]
Repayments of Long-term Debt		$ 72,800,000
Senior Secured Credit Facility [Member] | Bank of America [Member]
Repayments of Long-term Debt		73,000,000
Write off of Deferred Debt Issuance Cost		200,000
Interest Expense		200,000
Other Current Liabilities [Member]
Interest Payable, Current		100,000	$ 0.40
Write off of Deferred Debt Issuance Cost		194,000
Interest Expense		$ 2,584,000	$ 3,141,000	$ 2,581,000