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Note 1 - Description of Business and Summary of Significant Accounting Policies (Details Textual)	3 Months Ended						9 Months Ended		12 Months Ended
	Dec. 31, 2020 USD ($)	Jun. 30, 2020 USD ($)	Mar. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)	Mar. 31, 2020 USD ($)	Sep. 30, 2020	Apr. 01, 2020 USD ($)	Aug. 12, 2019
Number of Operating Segments							4
Retained Earnings (Accumulated Deficit), Ending Balance	$ 69,363,000		$ 72,359,000				$ 69,363,000		$ 72,359,000
Interest Expense, Debt, Total	$ 1,950,000			$ 1,888,000			5,803,000	$ 2,911,000
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2016-13 [Member]
Retained Earnings (Accumulated Deficit), Ending Balance											$ (9,000)
The Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage				1.375%				1.375%
The Notes [Member] | Senior Notes [Member]
Debt Instrument, Interest Rate, Stated Percentage			1.375%						1.375%	1.375%		1.375%
Interest Expense, Debt, Total							$ 3,510,000
Revision of Prior Period, Adjustment [Member]
Retained Earnings (Accumulated Deficit), Ending Balance		$ 192,000
Overstatement of Cost of Revenues [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount		372,000							$ 429,000
Overstatement of Accumulated Other Comprehensive Income [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount									429,000
Amount By Which Net Income Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount									429,000
Amount By Which Diluted Earnings Per Share Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount		0.04							$ 0.10
Overstatement of Cost of Goods Sold [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount			$ 128,000	$ 126,000	$ 110,000	$ 65,000
Understatement of Net Income [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount			$ 128,000	$ 126,000	$ 110,000	$ 65,000
Amount By Which After-tax Income Would Increase if Cost of Revenues Had Not Been Overstated [Member]
Quantifying Misstatement in Current Year Financial Statements, Amount		$ 192,000

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Contractual interest rate for funds borrowed, under the debt agreement.

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